5.2.0 Release

This allows the returned buffer to be a cached empty buf if the original buffer was already fully read

.github/FUNDING.yml

@@ -1,2 +1,3 @@
 github: kennytv
 patreon: kennytv
+custom: ['https://florianmichael.de/donate']

.gitignore

@@ -109,4 +109,7 @@ nb-configuration.xml
 .nb-gradle/
 
 ### MacOS ###
-.DS_Store
+.DS_Store
+
+### Run Folder (ViaProxy) ###
+common/run/

README.md

@@ -20,6 +20,13 @@ Supported Versions:
 
 **User Docs:** https://docs.viaversion.com/display/VIAVERSION/
 
+Snapshot support
+--------
+**ViaVersion will only be released a few days *after* a Minecraft update** unless the protocol changes of the update were trivial. If you want early-access, usually days or even weeks before the final release, you can subscribe to either:
+- [GitHub Sponsors](https://github.com/sponsors/kennytv/sponsorships?sponsor=kennytv&tier_id=385613&preview=false) (preferred option. Use the `/verify` command on this Discord after), or alternatively
+- [Patreon](https://www.patreon.com/kennytv/membership) (see the highest tier and make sure to link Patreon to your Discord account under Settings->Connections)
+  This also includes access to a private repository with the code, which will be pushed to the public repository after the given delay on a Minecraft update.
+
 Releases/Dev Builds
 --------
 You can find official releases in the following places:

api/src/main/java/com/viaversion/viaversion/api/configuration/ViaVersionConfig.java

@@ -478,4 +478,12 @@ public interface ViaVersionConfig extends Config {
      * @return true if enabled
      */
     boolean fix1_21PlacementRotation();
+
+    /**
+     * If enabled, 1.20.5+ clients will have sword blocking mechanics on 1.8 servers using the consumable item component.
+     * Note that you won't be able to see the blocking in first person if the client is older than 1.21.4.
+     *
+     * @return true if enabled
+     */
+    boolean swordBlockingViaConsumable();
 }

api/src/main/java/com/viaversion/viaversion/api/data/FullMappingsBase.java

@@ -95,7 +95,7 @@ public class FullMappingsBase implements FullMappings {
     }
 
     @Override
-    public String mappedIdentifier(final int mappedId) {
+    public @Nullable String mappedIdentifier(final int mappedId) {
         if (mappedId < 0 || mappedId >= mappedIdToString.length) {
             return null;
         }

api/src/main/java/com/viaversion/viaversion/api/data/MappingData.java

@@ -35,56 +35,82 @@ public interface MappingData {
     void load();
 
     /**
-     * Returns the mapped block state id, or -1 if unmapped.
+     * Returns the mapped block state id, or 0 if unmapped.
      *
      * @param id unmapped block state id
-     * @return mapped block state id, or -1 if unmapped
+     * @return mapped block state id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold block state mappings
      */
     int getNewBlockStateId(int id);
 
     /**
-     * Returns the mapped block id, or -1 if unmapped.
+     * Returns the mapped block id, or 0 if unmapped.
      *
      * @param id unmapped block id
-     * @return mapped block id, or -1 if unmapped
+     * @return mapped block id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold block mappings
      */
     int getNewBlockId(int id);
 
+    /**
+     * Returns the backwards mapped block id, or 1 if unmapped.
+     *
+     * @param id mapped block id
+     * @return backwards mapped block id, or 1 if unmapped
+     */
     int getOldBlockId(int id);
 
     /**
-     * Returns the mapped item id, or -1 if unmapped.
+     * Returns the mapped item id, or 0 if unmapped.
      *
      * @param id unmapped item id
-     * @return mapped item id, or -1 if unmapped
+     * @return mapped item id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold item mappings
      */
     int getNewItemId(int id);
 
     /**
-     * Returns the backwards mapped item id, or -1 if unmapped.
+     * Returns the backwards mapped item id, or 1 if unmapped.
      *
      * @param id mapped item id
-     * @return backwards mapped item id, or -1 if unmapped
+     * @return backwards mapped item id, or 1 if unmapped
      * @throws NullPointerException if this mappingdata does not hold item mappings
      */
     int getOldItemId(int id);
 
     /**
-     * Returns the mapped particle id, or -1 if unmapped.
+     * Returns the mapped particle id, or 0 if unmapped.
      *
      * @param id unmapped particle id
-     * @return mapped particle id, or -1 if unmapped
+     * @return mapped particle id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold particle mappings
      */
     int getNewParticleId(int id);
 
+    /**
+     * Returns the mapped attribute id, or 0 if unmapped.
+     *
+     * @param id unmapped attribute id
+     * @return mapped attribute id, or 0 if unmapped
+     * @throws NullPointerException if this mappingdata does not hold attribute mappings
+     */
     int getNewAttributeId(int id);
 
+    /**
+     * Returns the mapped sound id, or 0 if unmapped.
+     *
+     * @param id unmapped sound id
+     * @return mapped sound id, or 0 if unmapped
+     * @throws NullPointerException if this mappingdata does not hold sound mappings
+     */
     int getNewSoundId(int id);
 
+    /**
+     * Returns the backwards mapped sound id, or 1 if unmapped.
+     *
+     * @param i mapped sound id
+     * @return backwards mapped sound id, or 1 if unmapped
+     */
     int getOldSoundId(int i);
 
     /**

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataBase.java

@@ -179,7 +179,7 @@ public class MappingDataBase implements MappingData {
 
     @Override
     public int getOldBlockId(final int id) {
-        return blockMappings.getNewIdOrDefault(id, 1);
+        return blockMappings.inverse().getNewIdOrDefault(id, 1);
     }
 
     @Override

api/src/main/java/com/viaversion/viaversion/api/data/ParticleMappings.java

@@ -36,6 +36,7 @@ public class ParticleMappings extends FullMappingsBase {
         addBlockParticle("falling_dust");
         addBlockParticle("block_marker");
         addBlockParticle("dust_pillar");
+        addBlockParticle("block_crumble");
         addItemParticle("item");
     }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockPosition.java

@@ -37,6 +37,13 @@ public class BlockPosition {
         return new BlockPosition(x + face.modX(), y + face.modY(), z + face.modZ());
     }
 
+    public double distanceFromCenterSquared(final double x, final double y, final double z) {
+        final double dx = this.x + 0.5 - x;
+        final double dy = this.y + 0.5 - y;
+        final double dz = this.z + 0.5 - z;
+        return dx * dx + dy * dy + dz * dz;
+    }
+
     public int x() {
         return x;
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/ChunkPosition.java

@@ -66,6 +66,17 @@ public final class ChunkPosition {
         return (long) chunkX & 0xffffffffL | ((long) chunkZ & 0xffffffffL) << 32;
     }
 
+    /**
+     * Returns a long key for the given block coordinates.
+     *
+     * @param x the block X coordinate
+     * @param z the block Z coordinate
+     * @return the chunk key
+     */
+    public static long chunkKeyForBlock(final int x, final int z) {
+        return chunkKey(x >> 4, z >> 4);
+    }
+
     @Override
     public boolean equals(final Object o) {
         if (this == o) return true;

api/src/main/java/com/viaversion/viaversion/api/minecraft/PaintingVariant.java

@@ -22,13 +22,19 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.HolderType;
 import io.netty.buffer.ByteBuf;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
-public record PaintingVariant(int width, int height, String assetId) {
+public record PaintingVariant(int width, int height, String assetId, @Nullable Tag title, @Nullable Tag author) {
 
-    public static HolderType<PaintingVariant> TYPE = new HolderType<>() {
+    public PaintingVariant(final int width, final int height, final String assetId) {
+        this(width, height, assetId, null, null);
+    }
+
+    public static HolderType<PaintingVariant> TYPE1_21 = new HolderType<>() {
         @Override
         public PaintingVariant readDirect(final ByteBuf buffer) {
             final int width = Types.VAR_INT.readPrimitive(buffer);
@@ -44,4 +50,24 @@ public record PaintingVariant(int width, int height, String assetId) {
             Types.STRING.write(buffer, variant.assetId());
         }
     };
+    public static HolderType<PaintingVariant> TYPE1_21_2 = new HolderType<>() {
+        @Override
+        public PaintingVariant readDirect(final ByteBuf buffer) {
+            final int width = Types.VAR_INT.readPrimitive(buffer);
+            final int height = Types.VAR_INT.readPrimitive(buffer);
+            final String assetId = Types.STRING.read(buffer);
+            final Tag title = Types.OPTIONAL_TAG.read(buffer);
+            final Tag author = Types.OPTIONAL_TAG.read(buffer);
+            return new PaintingVariant(width, height, assetId, title, author);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final PaintingVariant variant) {
+            Types.VAR_INT.writePrimitive(buffer, variant.width());
+            Types.VAR_INT.writePrimitive(buffer, variant.height());
+            Types.STRING.write(buffer, variant.assetId());
+            Types.OPTIONAL_TAG.write(buffer, variant.title());
+            Types.OPTIONAL_TAG.write(buffer, variant.author());
+        }
+    };
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java

@@ -36,6 +36,7 @@ import com.viaversion.viaversion.api.minecraft.item.data.BannerPatternLayer;
 import com.viaversion.viaversion.api.minecraft.item.data.Bee;
 import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
 import com.viaversion.viaversion.api.minecraft.item.data.Consumable1_21_2;
+import com.viaversion.viaversion.api.minecraft.item.data.CustomModelData1_21_4;
 import com.viaversion.viaversion.api.minecraft.item.data.DamageResistant;
 import com.viaversion.viaversion.api.minecraft.item.data.DeathProtection;
 import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
@@ -59,9 +60,11 @@ import com.viaversion.viaversion.api.minecraft.item.data.UseCooldown;
 import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 import com.viaversion.viaversion.api.type.types.version.Types1_21;
 import com.viaversion.viaversion.api.type.types.version.Types1_21_2;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.util.Unit;
 
 public record StructuredDataKey<T>(String identifier, Type<T> type) {
@@ -74,14 +77,15 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<Tag> CUSTOM_NAME = new StructuredDataKey<>("custom_name", Types.TAG);
     public static final StructuredDataKey<Tag> ITEM_NAME = new StructuredDataKey<>("item_name", Types.TAG);
     public static final StructuredDataKey<String> ITEM_MODEL = new StructuredDataKey<>("item_model", Types.STRING);
-    public static final StructuredDataKey<Tag[]> LORE = new StructuredDataKey<>("lore", Types.TAG_ARRAY);
+    public static final StructuredDataKey<Tag[]> LORE = new StructuredDataKey<>("lore", new ArrayType<>(Types.TAG, 256));
     public static final StructuredDataKey<Integer> RARITY = new StructuredDataKey<>("rarity", Types.VAR_INT);
     public static final StructuredDataKey<Enchantments> ENCHANTMENTS = new StructuredDataKey<>("enchantments", Enchantments.TYPE);
     public static final StructuredDataKey<AdventureModePredicate> CAN_PLACE_ON = new StructuredDataKey<>("can_place_on", AdventureModePredicate.TYPE);
     public static final StructuredDataKey<AdventureModePredicate> CAN_BREAK = new StructuredDataKey<>("can_break", AdventureModePredicate.TYPE);
     public static final StructuredDataKey<AttributeModifiers1_20_5> ATTRIBUTE_MODIFIERS1_20_5 = new StructuredDataKey<>("attribute_modifiers", AttributeModifiers1_20_5.TYPE);
     public static final StructuredDataKey<AttributeModifiers1_21> ATTRIBUTE_MODIFIERS1_21 = new StructuredDataKey<>("attribute_modifiers", AttributeModifiers1_21.TYPE);
-    public static final StructuredDataKey<Integer> CUSTOM_MODEL_DATA = new StructuredDataKey<>("custom_model_data", Types.VAR_INT);
+    public static final StructuredDataKey<Integer> CUSTOM_MODEL_DATA1_20_5 = new StructuredDataKey<>("custom_model_data", Types.VAR_INT);
+    public static final StructuredDataKey<CustomModelData1_21_4> CUSTOM_MODEL_DATA1_21_4 = new StructuredDataKey<>("custom_model_data", CustomModelData1_21_4.TYPE);
     public static final StructuredDataKey<Unit> HIDE_ADDITIONAL_TOOLTIP = new StructuredDataKey<>("hide_additional_tooltip", Types.EMPTY);
     public static final StructuredDataKey<Unit> HIDE_TOOLTIP = new StructuredDataKey<>("hide_tooltip", Types.EMPTY);
     public static final StructuredDataKey<Integer> REPAIR_COST = new StructuredDataKey<>("repair_cost", Types.VAR_INT);
@@ -92,7 +96,8 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<FoodProperties1_20_5> FOOD1_21 = new StructuredDataKey<>("food", FoodProperties1_20_5.TYPE1_21);
     public static final StructuredDataKey<FoodProperties1_21_2> FOOD1_21_2 = new StructuredDataKey<>("food", FoodProperties1_21_2.TYPE);
     public static final StructuredDataKey<Consumable1_21_2> CONSUMABLE1_21_2 = new StructuredDataKey<>("consumable", Consumable1_21_2.TYPE);
-    public static final StructuredDataKey<Item> USE_REMAINDER = new StructuredDataKey<>("use_remainder", Types1_21_2.ITEM);
+    public static final StructuredDataKey<Item> USE_REMAINDER1_21_2 = new StructuredDataKey<>("use_remainder", Types1_21_2.ITEM);
+    public static final StructuredDataKey<Item> USE_REMAINDER1_21_4 = new StructuredDataKey<>("use_remainder", Types1_21_4.ITEM);
     public static final StructuredDataKey<UseCooldown> USE_COOLDOWN = new StructuredDataKey<>("use_cooldown", UseCooldown.TYPE);
     public static final StructuredDataKey<Unit> FIRE_RESISTANT = new StructuredDataKey<>("fire_resistant", Types.EMPTY);
     public static final StructuredDataKey<DamageResistant> DAMAGE_RESISTANT = new StructuredDataKey<>("damage_resistant", DamageResistant.TYPE);
@@ -112,15 +117,19 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_20_5 = new StructuredDataKey<>("charged_projectiles", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21 = new StructuredDataKey<>("charged_projectiles", Types1_21.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21_2 = new StructuredDataKey<>("charged_projectiles", Types1_21_2.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21_4 = new StructuredDataKey<>("charged_projectiles", Types1_21_4.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_20_5 = new StructuredDataKey<>("bundle_contents", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21 = new StructuredDataKey<>("bundle_contents", Types1_21.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21_2 = new StructuredDataKey<>("bundle_contents", Types1_21_2.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21_4 = new StructuredDataKey<>("bundle_contents", Types1_21_4.ITEM_ARRAY);
     public static final StructuredDataKey<PotionContents> POTION_CONTENTS1_20_5 = new StructuredDataKey<>("potion_contents", PotionContents.TYPE1_20_5);
     public static final StructuredDataKey<PotionContents> POTION_CONTENTS1_21_2 = new StructuredDataKey<>("potion_contents", PotionContents.TYPE1_21_2);
     public static final StructuredDataKey<SuspiciousStewEffect[]> SUSPICIOUS_STEW_EFFECTS = new StructuredDataKey<>("suspicious_stew_effects", SuspiciousStewEffect.ARRAY_TYPE);
     public static final StructuredDataKey<FilterableString[]> WRITABLE_BOOK_CONTENT = new StructuredDataKey<>("writable_book_content", FilterableString.ARRAY_TYPE);
     public static final StructuredDataKey<WrittenBook> WRITTEN_BOOK_CONTENT = new StructuredDataKey<>("written_book_content", WrittenBook.TYPE);
-    public static final StructuredDataKey<ArmorTrim> TRIM = new StructuredDataKey<>("trim", ArmorTrim.TYPE);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_20_5 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_20_5);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_21_2 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_21_2);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_21_4 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_21_4);
     public static final StructuredDataKey<CompoundTag> DEBUG_STICK_STATE = new StructuredDataKey<>("debug_stick_state", Types.COMPOUND_TAG);
     public static final StructuredDataKey<CompoundTag> ENTITY_DATA = new StructuredDataKey<>("entity_data", Types.COMPOUND_TAG);
     public static final StructuredDataKey<CompoundTag> BUCKET_ENTITY_DATA = new StructuredDataKey<>("bucket_entity_data", Types.COMPOUND_TAG);
@@ -140,7 +149,8 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<PotDecorations> POT_DECORATIONS = new StructuredDataKey<>("pot_decorations", PotDecorations.TYPE);
     public static final StructuredDataKey<Item[]> CONTAINER1_20_5 = new StructuredDataKey<>("container", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> CONTAINER1_21 = new StructuredDataKey<>("container", Types1_21.ITEM_ARRAY);
-    public static final StructuredDataKey<Item[]> CONTAINER1_21_2 = new StructuredDataKey<>("container", Types1_21_2.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> CONTAINER1_21_2 = new StructuredDataKey<>("container", new ArrayType<>(Types1_21_2.ITEM, 256));
+    public static final StructuredDataKey<Item[]> CONTAINER1_21_4 = new StructuredDataKey<>("container", Types1_21_4.ITEM_ARRAY);
     public static final StructuredDataKey<BlockStateProperties> BLOCK_STATE = new StructuredDataKey<>("block_state", BlockStateProperties.TYPE);
     public static final StructuredDataKey<Bee[]> BEES = new StructuredDataKey<>("bees", Bee.ARRAY_TYPE);
     public static final StructuredDataKey<Tag> LOCK = new StructuredDataKey<>("lock", Types.TAG);

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_21_2.java

@@ -212,7 +212,7 @@ public enum EntityTypes1_21_2 implements EntityType {
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
     CREAKING(ABSTRACT_MONSTER),
-    CREAKING_TRANSIENT(ABSTRACT_MONSTER),
+    CREAKING_TRANSIENT(CREAKING),
 
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_21_4.java

@@ -0,0 +1,313 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.entities;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.util.EntityTypeUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public enum EntityTypes1_21_4 implements EntityType {
+
+    ENTITY(null, null),
+
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    OMINOUS_ITEM_SPAWNER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
+
+    DISPLAY(ENTITY, null),
+    BLOCK_DISPLAY(DISPLAY),
+    ITEM_DISPLAY(DISPLAY),
+    TEXT_DISPLAY(DISPLAY),
+
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE(ENTITY, null),
+    ITEM_PROJECTILE(PROJECTILE, null),
+    SNOWBALL(ITEM_PROJECTILE),
+    ENDER_PEARL(ITEM_PROJECTILE),
+    EGG(ITEM_PROJECTILE),
+    POTION(ITEM_PROJECTILE),
+    EXPERIENCE_BOTTLE(ITEM_PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    ABSTRACT_WIND_CHARGE(PROJECTILE, null),
+    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    ABSTRACT_BOAT(VEHICLE, null),
+    ABSTRACT_CHEST_BOAT(ABSTRACT_BOAT, null),
+    ACACIA_BOAT(ABSTRACT_BOAT),
+    ACACIA_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_CHEST_RAFT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_RAFT(ABSTRACT_BOAT),
+    BIRCH_BOAT(ABSTRACT_BOAT),
+    BIRCH_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    CHERRY_BOAT(ABSTRACT_BOAT),
+    CHERRY_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    DARK_OAK_BOAT(ABSTRACT_BOAT),
+    DARK_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    JUNGLE_BOAT(ABSTRACT_BOAT),
+    JUNGLE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    MANGROVE_BOAT(ABSTRACT_BOAT),
+    MANGROVE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    OAK_BOAT(ABSTRACT_BOAT),
+    OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    PALE_OAK_BOAT(ABSTRACT_BOAT),
+    PALE_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    SPRUCE_BOAT(ABSTRACT_BOAT),
+    SPRUCE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+    ARMADILLO(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    BREEZE(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    WARDEN(ABSTRACT_MONSTER),
+    CREAKING(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+    BOGGED(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Water mobs
+    AGEABLE_WATER_CREATURE(ABSTRACT_AGEABLE, null),
+    DOLPHIN(AGEABLE_WATER_CREATURE),
+
+    SQUID(AGEABLE_WATER_CREATURE),
+    GLOW_SQUID(SQUID),
+
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
+    private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
+
+    EntityTypes1_21_4(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
+    }
+
+    EntityTypes1_21_4(final EntityType parent, @Nullable final String identifier) {
+        this.parent = parent;
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
+        return id;
+    }
+
+    @Override
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
+        return parent;
+    }
+
+    @Override
+    public boolean isAbstractType() {
+        return identifier == null;
+    }
+
+    public static EntityType getTypeFromId(final int typeId) {
+        return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
+    }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_21.java

@@ -60,7 +60,7 @@ public final class EntityDataTypes1_21 extends AbstractEntityDataTypes {
     public final EntityDataType wolfVariantType = add(23, WolfVariant.TYPE);
     public final EntityDataType frogVariantType = add(24, Types.VAR_INT);
     public final EntityDataType optionalGlobalPosition = add(25, Types.OPTIONAL_GLOBAL_POSITION);
-    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE);
+    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE1_21);
     public final EntityDataType snifferState = add(27, Types.VAR_INT);
     public final EntityDataType armadilloState = add(28, Types.VAR_INT);
     public final EntityDataType vector3FType = add(29, Types.VECTOR3F);

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_21_2.java

@@ -0,0 +1,74 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.PaintingVariant;
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.WolfVariant;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_21_2 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.TAG);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_TAG);
+    public final EntityDataType itemType;
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType particlesType;
+    public final EntityDataType villagerDatatType = add(19, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(20, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(21, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType wolfVariantType = add(23, WolfVariant.TYPE);
+    public final EntityDataType frogVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(25, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE1_21_2);
+    public final EntityDataType snifferState = add(27, Types.VAR_INT);
+    public final EntityDataType armadilloState = add(28, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(29, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(30, Types.QUATERNION);
+
+    public EntityDataTypes1_21_2(final Type<Item> itemType, final ParticleType particleType, final Type<Particle[]> particlesType) {
+        super(31);
+        this.itemType = add(7, itemType);
+        this.particleType = add(17, particleType);
+        this.particlesType = add(18, particlesType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/ArmorTrim.java

@@ -29,10 +29,10 @@ import it.unimi.dsi.fastutil.ints.Int2IntFunction;
 
 public record ArmorTrim(Holder<ArmorTrimMaterial> material, Holder<ArmorTrimPattern> pattern, boolean showInTooltip) {
 
-    public static final Type<ArmorTrim> TYPE = new Type<>(ArmorTrim.class) {
+    public static final Type<ArmorTrim> TYPE1_20_5 = new Type<>(ArmorTrim.class) {
         @Override
         public ArmorTrim read(final ByteBuf buffer) {
-            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE.read(buffer);
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_20_5.read(buffer);
             final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
             final boolean showInTooltip = buffer.readBoolean();
             return new ArmorTrim(material, pattern, showInTooltip);
@@ -40,7 +40,39 @@ public record ArmorTrim(Holder<ArmorTrimMaterial> material, Holder<ArmorTrimPatt
 
         @Override
         public void write(final ByteBuf buffer, final ArmorTrim value) {
-            ArmorTrimMaterial.TYPE.write(buffer, value.material);
+            ArmorTrimMaterial.TYPE1_20_5.write(buffer, value.material);
+            ArmorTrimPattern.TYPE.write(buffer, value.pattern);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+    public static final Type<ArmorTrim> TYPE1_21_2 = new Type<>(ArmorTrim.class) {
+        @Override
+        public ArmorTrim read(final ByteBuf buffer) {
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_21_2.read(buffer);
+            final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
+            final boolean showInTooltip = buffer.readBoolean();
+            return new ArmorTrim(material, pattern, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final ArmorTrim value) {
+            ArmorTrimMaterial.TYPE1_21_2.write(buffer, value.material);
+            ArmorTrimPattern.TYPE.write(buffer, value.pattern);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+    public static final Type<ArmorTrim> TYPE1_21_4 = new Type<>(ArmorTrim.class) {
+        @Override
+        public ArmorTrim read(final ByteBuf buffer) {
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_21_4.read(buffer);
+            final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
+            final boolean showInTooltip = buffer.readBoolean();
+            return new ArmorTrim(material, pattern, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final ArmorTrim value) {
+            ArmorTrimMaterial.TYPE1_21_4.write(buffer, value.material);
             ArmorTrimPattern.TYPE.write(buffer, value.pattern);
             buffer.writeBoolean(value.showInTooltip);
         }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/ArmorTrimMaterial.java

@@ -27,13 +27,19 @@ import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.HolderType;
 import io.netty.buffer.ByteBuf;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap;
+import java.util.Map;
 
 public record ArmorTrimMaterial(String assetName, int itemId, float itemModelIndex,
-                                Int2ObjectMap<String> overrideArmorMaterials, Tag description) {
+                                Map<String, String> overrideArmorMaterials, Tag description) {
 
-    public static final HolderType<ArmorTrimMaterial> TYPE = new HolderType<>() {
+    public ArmorTrimMaterial(final String assetName, final int itemId, final Map<String, String> overrideArmorMaterials, final Tag description) {
+        this(assetName, itemId, 0F, overrideArmorMaterials, description);
+    }
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_20_5 = new HolderType<>() {
+        // The override key is an int, but given we don't use it at all and that creating a new type is annoying,
+        // we'll just store it in the string map:tm:
         @Override
         public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
             final String assetName = Types.STRING.read(buffer);
@@ -41,10 +47,45 @@ public record ArmorTrimMaterial(String assetName, int itemId, float itemModelInd
             final float itemModelIndex = buffer.readFloat();
 
             final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
-            final Int2ObjectMap<String> overrideArmorMaterials = new Int2ObjectOpenHashMap<>(overrideArmorMaterialsSize);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
             for (int i = 0; i < overrideArmorMaterialsSize; i++) {
                 final int key = Types.VAR_INT.readPrimitive(buffer);
                 final String value = Types.STRING.read(buffer);
+                overrideArmorMaterials.put(Integer.toString(key), value);
+            }
+
+            final Tag description = Types.TAG.read(buffer);
+            return new ArmorTrimMaterial(assetName, item, itemModelIndex, overrideArmorMaterials, description);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final ArmorTrimMaterial value) {
+            Types.STRING.write(buffer, value.assetName());
+            Types.VAR_INT.writePrimitive(buffer, value.itemId());
+            buffer.writeFloat(value.itemModelIndex());
+
+            Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.VAR_INT.writePrimitive(buffer, Integer.parseInt(entry.getKey()));
+                Types.STRING.write(buffer, entry.getValue());
+            }
+
+            Types.TAG.write(buffer, value.description());
+        }
+    };
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_21_2 = new HolderType<>() {
+        @Override
+        public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
+            final String assetName = Types.STRING.read(buffer);
+            final int item = Types.VAR_INT.readPrimitive(buffer);
+            final float itemModelIndex = buffer.readFloat();
+
+            final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
+            for (int i = 0; i < overrideArmorMaterialsSize; i++) {
+                final String key = Types.STRING.read(buffer);
+                final String value = Types.STRING.read(buffer);
                 overrideArmorMaterials.put(key, value);
             }
 
@@ -59,8 +100,41 @@ public record ArmorTrimMaterial(String assetName, int itemId, float itemModelInd
             buffer.writeFloat(value.itemModelIndex());
 
             Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
-            for (final Int2ObjectMap.Entry<String> entry : value.overrideArmorMaterials().int2ObjectEntrySet()) {
-                Types.VAR_INT.writePrimitive(buffer, entry.getIntKey());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.STRING.write(buffer, entry.getKey());
+                Types.STRING.write(buffer, entry.getValue());
+            }
+
+            Types.TAG.write(buffer, value.description());
+        }
+    };
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_21_4 = new HolderType<>() {
+        @Override
+        public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
+            final String assetName = Types.STRING.read(buffer);
+            final int item = Types.VAR_INT.readPrimitive(buffer);
+
+            final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
+            for (int i = 0; i < overrideArmorMaterialsSize; i++) {
+                final String key = Types.STRING.read(buffer);
+                final String value = Types.STRING.read(buffer);
+                overrideArmorMaterials.put(key, value);
+            }
+
+            final Tag description = Types.TAG.read(buffer);
+            return new ArmorTrimMaterial(assetName, item, overrideArmorMaterials, description);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final ArmorTrimMaterial value) {
+            Types.STRING.write(buffer, value.assetName());
+            Types.VAR_INT.writePrimitive(buffer, value.itemId());
+
+            Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.STRING.write(buffer, entry.getKey());
                 Types.STRING.write(buffer, entry.getValue());
             }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/CustomModelData1_21_4.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public record CustomModelData1_21_4(float[] floats, boolean[] booleans, String[] strings, int[] colors) {
+
+    public static final Type<CustomModelData1_21_4> TYPE = new Type<>(CustomModelData1_21_4.class) {
+        @Override
+        public CustomModelData1_21_4 read(final ByteBuf buffer) {
+            final float[] floats = Types.FLOAT_ARRAY_PRIMITIVE.read(buffer);
+            final boolean[] booleans = Types.BOOLEAN_ARRAY_PRIMITIVE.read(buffer);
+            final String[] strings = Types.STRING_ARRAY.read(buffer);
+            final int[] colors = Types.INT_ARRAY_PRIMITIVE.read(buffer);
+            return new CustomModelData1_21_4(floats, booleans, strings, colors);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final CustomModelData1_21_4 value) {
+            Types.FLOAT_ARRAY_PRIMITIVE.write(buffer, value.floats());
+            Types.BOOLEAN_ARRAY_PRIMITIVE.write(buffer, value.booleans());
+            Types.STRING_ARRAY.write(buffer, value.strings());
+            Types.INT_ARRAY_PRIMITIVE.write(buffer, value.colors());
+        }
+    };
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Equippable.java

@@ -42,7 +42,7 @@ public record Equippable(int equipmentSlot, Holder<SoundEvent> soundEvent, @Null
             final Holder<SoundEvent> soundEvent = Types.SOUND_EVENT.read(buffer);
             final String model = Types.OPTIONAL_STRING.read(buffer);
             final String cameraOverlay = Types.OPTIONAL_STRING.read(buffer);
-            final HolderSet allowedEntities = Types.HOLDER_SET.read(buffer);
+            final HolderSet allowedEntities = Types.OPTIONAL_HOLDER_SET.read(buffer);
             final boolean dispensable = buffer.readBoolean();
             final boolean swappable = buffer.readBoolean();
             final boolean damageOnHurt = buffer.readBoolean();
@@ -55,7 +55,7 @@ public record Equippable(int equipmentSlot, Holder<SoundEvent> soundEvent, @Null
             Types.SOUND_EVENT.write(buffer, value.soundEvent());
             Types.OPTIONAL_STRING.write(buffer, value.model());
             Types.OPTIONAL_STRING.write(buffer, value.cameraOverlay());
-            Types.HOLDER_SET.write(buffer, value.allowedEntities());
+            Types.OPTIONAL_HOLDER_SET.write(buffer, value.allowedEntities());
             buffer.writeBoolean(value.dispensable());
             buffer.writeBoolean(value.swappable());
             buffer.writeBoolean(value.damageOnHurt());

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/FoodProperties1_20_5.java

@@ -28,9 +28,10 @@ import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.version.Types1_21;
 import io.netty.buffer.ByteBuf;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public record FoodProperties1_20_5(int nutrition, float saturationModifier, boolean canAlwaysEat, float eatSeconds,
-                                   Item usingConvertsTo, FoodEffect[] possibleEffects) {
+                                   @Nullable Item usingConvertsTo, FoodEffect[] possibleEffects) {
 
     public static final Type<FoodProperties1_20_5> TYPE1_20_5 = new Type<>(FoodProperties1_20_5.class) {
         @Override

api/src/main/java/com/viaversion/viaversion/api/protocol/Protocol.java

@@ -36,6 +36,7 @@ import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
 import com.viaversion.viaversion.api.rewriter.ComponentRewriter;
 import com.viaversion.viaversion.api.rewriter.EntityRewriter;
 import com.viaversion.viaversion.api.rewriter.ItemRewriter;
+import com.viaversion.viaversion.api.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.api.rewriter.TagRewriter;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.exception.CancelException;
@@ -374,6 +375,15 @@ public interface Protocol<CU extends ClientboundPacketType, CM extends Clientbou
         return null;
     }
 
+    /**
+     * Returns the protocol's particle rewriter if present.
+     *
+     * @return particle rewriter
+     */
+    default @Nullable ParticleRewriter getParticleRewriter() {
+        return null;
+    }
+
     /**
      * Returns the protocol's tag rewriter if present.
      *

api/src/main/java/com/viaversion/viaversion/api/protocol/version/ProtocolVersion.java

@@ -87,6 +87,7 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     public static final ProtocolVersion v1_20_5 = register(766, "1.20.5-1.20.6", new SubVersionRange("1.20", 5, 6));
     public static final ProtocolVersion v1_21 = register(767, "1.21-1.21.1", new SubVersionRange("1.21", 0, 1));
     public static final ProtocolVersion v1_21_2 = register(768, "1.21.2-1.21.3", new SubVersionRange("1.21", 2, 3));
+    public static final ProtocolVersion v1_21_4 = register(769, "1.21.4");
     public static final ProtocolVersion unknown = new ProtocolVersion(VersionType.SPECIAL, -1, -1, "UNKNOWN", null);
 
     static {

api/src/main/java/com/viaversion/viaversion/api/rewriter/EntityRewriter.java

@@ -58,6 +58,14 @@ public interface EntityRewriter<T extends Protocol<?, ?, ?, ?>> extends Rewriter
      */
     int newEntityId(int id);
 
+    /**
+     * Returns the mapped entity (or the same if it has not changed).
+     *
+     * @param identifier unmapped entity identifier
+     * @return mapped entity identifier
+     */
+    String mappedEntityIdentifier(String identifier);
+
     /**
      * Handles and transforms entity data of an entity.
      *

api/src/main/java/com/viaversion/viaversion/api/rewriter/ItemRewriter.java

@@ -23,7 +23,6 @@
 package com.viaversion.viaversion.api.rewriter;
 
 import com.viaversion.viaversion.api.connection.UserConnection;
-import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.type.Type;
@@ -51,8 +50,6 @@ public interface ItemRewriter<T extends Protocol<?, ?, ?, ?>> extends Rewriter<T
     @Nullable
     Item handleItemToServer(UserConnection connection, @Nullable Item item);
 
-    void rewriteParticle(UserConnection connection, Particle particle);
-
     /**
      * Returns the item type of the current protocol.
      *

api/src/main/java/com/viaversion/viaversion/api/rewriter/ParticleRewriter.java

@@ -0,0 +1,27 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.api.rewriter;
+
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.Particle;
+
+public interface ParticleRewriter {
+
+    void rewriteParticle(UserConnection connection, Particle particle);
+
+}

api/src/main/java/com/viaversion/viaversion/api/type/Types.java

@@ -45,12 +45,14 @@ import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
 import com.viaversion.viaversion.api.minecraft.ChunkPosition;
 import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.BitSetType;
+import com.viaversion.viaversion.api.type.types.BooleanArrayType;
 import com.viaversion.viaversion.api.type.types.BooleanType;
 import com.viaversion.viaversion.api.type.types.ByteArrayType;
 import com.viaversion.viaversion.api.type.types.ByteType;
 import com.viaversion.viaversion.api.type.types.ComponentType;
 import com.viaversion.viaversion.api.type.types.DoubleType;
 import com.viaversion.viaversion.api.type.types.EmptyType;
+import com.viaversion.viaversion.api.type.types.FloatArrayType;
 import com.viaversion.viaversion.api.type.types.FloatType;
 import com.viaversion.viaversion.api.type.types.IntArrayType;
 import com.viaversion.viaversion.api.type.types.IntType;
@@ -115,14 +117,17 @@ public final class Types {
     public static final Type<byte[]> OPTIONAL_BYTE_ARRAY_PRIMITIVE = new ByteArrayType.OptionalByteArrayType();
     public static final Type<byte[]> SHORT_BYTE_ARRAY = new ShortByteArrayType();
     public static final Type<byte[]> REMAINING_BYTES = new RemainingBytesType();
-    public static final Type<int[]> INT_ARRAY_PRIMITIVE = new IntArrayType();
 
     public static final ShortType SHORT = new ShortType();
     public static final UnsignedShortType UNSIGNED_SHORT = new UnsignedShortType();
 
     public static final IntType INT = new IntType();
+    public static final Type<int[]> INT_ARRAY_PRIMITIVE = new IntArrayType();
+
     public static final FloatType FLOAT = new FloatType();
     public static final FloatType.OptionalFloatType OPTIONAL_FLOAT = new FloatType.OptionalFloatType();
+    public static final Type<float[]> FLOAT_ARRAY_PRIMITIVE = new FloatArrayType();
+
     public static final DoubleType DOUBLE = new DoubleType();
 
     public static final LongType LONG = new LongType();
@@ -130,6 +135,7 @@ public final class Types {
 
     public static final BooleanType BOOLEAN = new BooleanType();
     public static final BooleanType.OptionalBooleanType OPTIONAL_BOOLEAN = new BooleanType.OptionalBooleanType();
+    public static final Type<boolean[]> BOOLEAN_ARRAY_PRIMITIVE = new BooleanArrayType();
 
     /* Other Types */
     public static final Type<JsonElement> COMPONENT = new ComponentType();
@@ -149,6 +155,8 @@ public final class Types {
     public static final VarLongType VAR_LONG = new VarLongType();
 
     /* MC Types */
+    public static final Type<byte[]> SERVERBOUND_CUSTOM_PAYLOAD_DATA = new RemainingBytesType(Short.MAX_VALUE);
+
     public static final Type<BlockPosition> BLOCK_POSITION1_8 = new BlockPositionType1_8();
     public static final Type<BlockPosition> OPTIONAL_POSITION1_8 = new BlockPositionType1_8.OptionalBlockPositionType();
     public static final Type<BlockPosition> BLOCK_POSITION1_14 = new BlockPositionType1_14();
@@ -191,6 +199,7 @@ public final class Types {
 
     public static final BitSetType PROFILE_ACTIONS_ENUM1_19_3 = new BitSetType(6);
     public static final BitSetType PROFILE_ACTIONS_ENUM1_21_2 = new BitSetType(7);
+    public static final BitSetType PROFILE_ACTIONS_ENUM1_21_4 = new BitSetType(8);
 
     public static final ByteArrayType SIGNATURE_BYTES = new ByteArrayType(256);
     public static final BitSetType ACKNOWLEDGED_BIT_SET = new BitSetType(20);

api/src/main/java/com/viaversion/viaversion/api/type/types/ArrayType.java

@@ -26,13 +26,22 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
 import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.List;
 
 public class ArrayType<T> extends Type<T[]> {
     private final Type<T> elementType;
+    private final int maxLength;
 
     public ArrayType(Type<T> type) {
+        this(type, -1);
+    }
+
+    public ArrayType(Type<T> type, int maxLength) {
+        //noinspection unchecked
         super(type.getTypeName() + " Array", (Class<T[]>) getArrayClass(type.getOutputClass()));
         this.elementType = type;
+        this.maxLength = maxLength;
     }
 
     public static Class<?> getArrayClass(Class<?> componentType) {
@@ -43,16 +52,40 @@ public class ArrayType<T> extends Type<T[]> {
     @Override
     public T[] read(ByteBuf buffer) {
         int amount = Types.VAR_INT.readPrimitive(buffer);
-        T[] array = (T[]) Array.newInstance(elementType.getOutputClass(), amount);
+        if (maxLength != -1 && amount > maxLength) {
+            throw new IllegalArgumentException("Array length " + amount + " is longer than maximum " + maxLength);
+        }
 
-        for (int i = 0; i < amount; i++) {
+        return amount < Short.MAX_VALUE ? readArray(buffer, amount) : readList(buffer, amount);
+    }
+
+    private T[] readArray(ByteBuf buffer, int length) {
+        T[] array = createArray(length);
+        for (int i = 0; i < length; i++) {
             array[i] = elementType.read(buffer);
         }
         return array;
     }
 
+    private T[] readList(ByteBuf buffer, int length) {
+        List<T> list = new ArrayList<>();
+        for (int i = 0; i < length; i++) {
+            list.add(elementType.read(buffer));
+        }
+        return list.toArray(createArray(0));
+    }
+
+    private T[] createArray(int length) {
+        //noinspection unchecked
+        return (T[]) Array.newInstance(elementType.getOutputClass(), length);
+    }
+
     @Override
     public void write(ByteBuf buffer, T[] object) {
+        if (maxLength != -1 && object.length > maxLength) {
+            throw new IllegalArgumentException("Array length " + object.length + " is longer than maximum " + maxLength);
+        }
+
         Types.VAR_INT.writePrimitive(buffer, object.length);
         for (T o : object) {
             elementType.write(buffer, o);

api/src/main/java/com/viaversion/viaversion/api/type/types/BooleanArrayType.java

@@ -0,0 +1,67 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+// Ok...
+public class BooleanArrayType extends Type<boolean[]> {
+
+    private final int length;
+
+    public BooleanArrayType(final int length) {
+        super(boolean[].class);
+        this.length = length;
+    }
+
+    public BooleanArrayType() {
+        super(boolean[].class);
+        this.length = -1;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final boolean[] object) {
+        if (this.length != -1) {
+            Preconditions.checkArgument(length == object.length, "Length does not match expected length");
+        } else {
+            Types.VAR_INT.writePrimitive(buffer, object.length);
+        }
+        for (final boolean b : object) {
+            buffer.writeBoolean(b);
+        }
+    }
+
+    @Override
+    public boolean[] read(final ByteBuf buffer) {
+        final int length = this.length == -1 ? Types.VAR_INT.readPrimitive(buffer) : this.length;
+        Preconditions.checkArgument(buffer.isReadable(length), "Length is fewer than readable bytes");
+        final boolean[] array = new boolean[length];
+        for (int i = 0; i < length; i++) {
+            array[i] = buffer.readBoolean();
+        }
+        return array;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/FloatArrayType.java

@@ -0,0 +1,66 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public class FloatArrayType extends Type<float[]> {
+
+    private final int length;
+
+    public FloatArrayType(final int length) {
+        super(float[].class);
+        this.length = length;
+    }
+
+    public FloatArrayType() {
+        super(float[].class);
+        this.length = -1;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final float[] object) {
+        if (this.length != -1) {
+            Preconditions.checkArgument(length == object.length, "Length does not match expected length");
+        } else {
+            Types.VAR_INT.writePrimitive(buffer, object.length);
+        }
+        for (final float f : object) {
+            buffer.writeFloat(f);
+        }
+    }
+
+    @Override
+    public float[] read(final ByteBuf buffer) {
+        final int length = this.length == -1 ? Types.VAR_INT.readPrimitive(buffer) : this.length;
+        Preconditions.checkArgument(buffer.isReadable(length), "Length is fewer than readable bytes");
+        final float[] array = new float[length];
+        for (int i = 0; i < length; i++) {
+            array[i] = buffer.readFloat();
+        }
+        return array;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/RemainingBytesType.java

@@ -26,19 +26,35 @@ import com.viaversion.viaversion.api.type.Type;
 import io.netty.buffer.ByteBuf;
 
 public class RemainingBytesType extends Type<byte[]> {
+    private final int maxLength;
+
     public RemainingBytesType() {
+        this(-1);
+    }
+
+    public RemainingBytesType(final int maxLength) {
         super(byte[].class);
+        this.maxLength = maxLength;
     }
 
     @Override
-    public byte[] read(ByteBuf buffer) {
-        byte[] array = new byte[buffer.readableBytes()];
+    public byte[] read(final ByteBuf buffer) {
+        final int bytes = buffer.readableBytes();
+        if (maxLength != -1 && bytes > maxLength) {
+            throw new RuntimeException("Remaining bytes cannot be longer than " + maxLength + " (got " + bytes + ")");
+        }
+
+        final byte[] array = new byte[bytes];
         buffer.readBytes(array);
         return array;
     }
 
     @Override
-    public void write(ByteBuf buffer, byte[] object) {
+    public void write(final ByteBuf buffer, final byte[] object) {
+        if (maxLength != -1 && object.length > maxLength) {
+            throw new RuntimeException("Remaining bytes cannot be longer than " + maxLength + " (got " + object.length + ")");
+        }
+
         buffer.writeBytes(object);
     }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/VarIntType.java

@@ -32,6 +32,15 @@ public class VarIntType extends Type<Integer> implements TypeConverter<Integer>
     private static final int VALUE_BITS = 0x7F;
     private static final int MULTI_BYTE_BITS = ~VALUE_BITS;
     private static final int MAX_BYTES = 5;
+    private static final int[] VAR_INT_LENGTHS = new int[65];
+
+    static {
+        // Copied from Velocity https://github.com/PaperMC/Velocity/blob/08a42b3723633ea5eb6b96c0bb42180f3c2b07eb/proxy/src/main/java/com/velocitypowered/proxy/protocol/ProtocolUtils.java#L166
+        for (int i = 0; i <= 32; ++i) {
+            VAR_INT_LENGTHS[i] = (int) Math.ceil((31d - (i - 1)) / 7d);
+        }
+        VAR_INT_LENGTHS[32] = 1; // Special case for the number 0.
+    }
 
     public VarIntType() {
         super("VarInt", Integer.class);
@@ -88,4 +97,8 @@ public class VarIntType extends Type<Integer> implements TypeConverter<Integer>
         }
         throw new UnsupportedOperationException();
     }
-}
+
+    public static int varIntLength(final int value) {
+        return VAR_INT_LENGTHS[Integer.numberOfLeadingZeros(value)];
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkSectionType1_18.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.type.types.chunk;
 
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSectionImpl;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
@@ -54,4 +55,14 @@ public final class ChunkSectionType1_18 extends Type<ChunkSection> {
         blockPaletteType.write(buffer, section.palette(PaletteType.BLOCKS));
         biomePaletteType.write(buffer, section.palette(PaletteType.BIOMES));
     }
+
+    public int serializedSize(final Chunk chunk) {
+        int length = 0;
+        for (final ChunkSection section : chunk.getSections()) {
+            length += Short.BYTES
+                + blockPaletteType.serializedSize(section.palette(PaletteType.BLOCKS))
+                + biomePaletteType.serializedSize(section.palette(PaletteType.BIOMES));
+        }
+        return length;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkType1_18.java

@@ -52,14 +52,10 @@ public final class ChunkType1_18 extends Type<Chunk> {
         final CompoundTag heightMap = Types.NAMED_COMPOUND_TAG.read(buffer);
 
         // Read sections
-        final ByteBuf sectionsBuf = buffer.readBytes(Types.VAR_INT.readPrimitive(buffer));
+        final ByteBuf sectionsBuf = buffer.readSlice(Types.VAR_INT.readPrimitive(buffer));
         final ChunkSection[] sections = new ChunkSection[ySectionCount];
-        try {
-            for (int i = 0; i < ySectionCount; i++) {
-                sections[i] = sectionType.read(sectionsBuf);
-            }
-        } finally {
-            sectionsBuf.release();
+        for (int i = 0; i < ySectionCount; i++) {
+            sections[i] = sectionType.read(sectionsBuf);
         }
 
         final int blockEntitiesLength = Types.VAR_INT.readPrimitive(buffer);
@@ -78,16 +74,9 @@ public final class ChunkType1_18 extends Type<Chunk> {
 
         Types.NAMED_COMPOUND_TAG.write(buffer, chunk.getHeightMap());
 
-        final ByteBuf sectionBuffer = buffer.alloc().buffer();
-        try {
-            for (final ChunkSection section : chunk.getSections()) {
-                sectionType.write(sectionBuffer, section);
-            }
-            sectionBuffer.readerIndex(0);
-            Types.VAR_INT.writePrimitive(buffer, sectionBuffer.readableBytes());
-            buffer.writeBytes(sectionBuffer);
-        } finally {
-            sectionBuffer.release(); // release buffer
+        Types.VAR_INT.writePrimitive(buffer, sectionType.serializedSize(chunk));
+        for (final ChunkSection section : chunk.getSections()) {
+            sectionType.write(buffer, section);
         }
 
         Types.VAR_INT.writePrimitive(buffer, chunk.blockEntities().size());

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkType1_20_2.java

@@ -52,14 +52,10 @@ public final class ChunkType1_20_2 extends Type<Chunk> {
         final CompoundTag heightMap = Types.COMPOUND_TAG.read(buffer);
 
         // Read sections
-        final ByteBuf sectionsBuf = buffer.readBytes(Types.VAR_INT.readPrimitive(buffer));
+        final ByteBuf sectionsBuf = buffer.readSlice(Types.VAR_INT.readPrimitive(buffer));
         final ChunkSection[] sections = new ChunkSection[ySectionCount];
-        try {
-            for (int i = 0; i < ySectionCount; i++) {
-                sections[i] = sectionType.read(sectionsBuf);
-            }
-        } finally {
-            sectionsBuf.release();
+        for (int i = 0; i < ySectionCount; i++) {
+            sections[i] = sectionType.read(sectionsBuf);
         }
 
         final int blockEntitiesLength = Types.VAR_INT.readPrimitive(buffer);
@@ -78,16 +74,9 @@ public final class ChunkType1_20_2 extends Type<Chunk> {
 
         Types.COMPOUND_TAG.write(buffer, chunk.getHeightMap());
 
-        final ByteBuf sectionBuffer = buffer.alloc().buffer();
-        try {
-            for (final ChunkSection section : chunk.getSections()) {
-                sectionType.write(sectionBuffer, section);
-            }
-            sectionBuffer.readerIndex(0);
-            Types.VAR_INT.writePrimitive(buffer, sectionBuffer.readableBytes());
-            buffer.writeBytes(sectionBuffer);
-        } finally {
-            sectionBuffer.release(); // release buffer
+        Types.VAR_INT.writePrimitive(buffer, sectionType.serializedSize(chunk));
+        for (final ChunkSection section : chunk.getSections()) {
+            sectionType.write(buffer, section);
         }
 
         Types.VAR_INT.writePrimitive(buffer, chunk.blockEntities().size());

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/PaletteType1_18.java

@@ -27,6 +27,7 @@ import com.viaversion.viaversion.api.minecraft.chunks.DataPaletteImpl;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.VarIntType;
 import com.viaversion.viaversion.util.CompactArrayUtil;
 import com.viaversion.viaversion.util.MathUtil;
 import io.netty.buffer.ByteBuf;
@@ -94,13 +95,7 @@ public final class PaletteType1_18 extends Type<DataPalette> {
             return;
         }
 
-        // 1, 2, and 3 bit linear block palettes can't be read by the client
-        final int min = type == PaletteType.BLOCKS ? 4 : 1;
-        int bitsPerValue = Math.max(min, MathUtil.ceilLog2(size));
-        if (bitsPerValue > type.highestBitsPerValue()) {
-            bitsPerValue = globalPaletteBits;
-        }
-
+        final int bitsPerValue = bitsPerValue(size);
         buffer.writeByte(bitsPerValue);
 
         if (bitsPerValue != globalPaletteBits) {
@@ -113,4 +108,39 @@ public final class PaletteType1_18 extends Type<DataPalette> {
 
         Types.LONG_ARRAY_PRIMITIVE.write(buffer, CompactArrayUtil.createCompactArrayWithPadding(bitsPerValue, type.size(), bitsPerValue == globalPaletteBits ? palette::idAt : palette::paletteIndexAt));
     }
+
+    private int bitsPerValue(final int size) {
+        // 1, 2, and 3 bit linear block palettes can't be read by the client
+        final int min = type == PaletteType.BLOCKS ? 4 : 1;
+        int bitsPerValue = Math.max(min, MathUtil.ceilLog2(size));
+        if (bitsPerValue > type.highestBitsPerValue()) {
+            bitsPerValue = globalPaletteBits;
+        }
+        return bitsPerValue;
+    }
+
+    public int serializedSize(final DataPalette palette) {
+        // This is a bit of extra work, but worth it to avoid otherwise having to allocate and write to an extra buffer.
+        // On top of saving memory, it provides small but measurable speedup compared to writing to a separate buffer and then back
+        final int size = palette.size();
+        final int bitsPerValue = bitsPerValue(size);
+        int serializedTypesSize = 0;
+        int serializedValuesSize = 1; // At least one byte for 0 length
+        if (size == 1) {
+            serializedTypesSize = VarIntType.varIntLength(palette.idByIndex(0));
+        } else {
+            if (bitsPerValue != globalPaletteBits) {
+                serializedTypesSize = VarIntType.varIntLength(size);
+                for (int i = 0; i < size; i++) {
+                    serializedTypesSize += VarIntType.varIntLength(palette.idByIndex(i));
+                }
+            }
+
+            final int valuesPerLong = 64 / bitsPerValue;
+            final int values = (type.size() + valuesPerLong - 1) / valuesPerLong;
+            serializedValuesSize = VarIntType.varIntLength(values) + (Long.BYTES * values);
+        }
+
+        return Byte.BYTES + serializedTypesSize + serializedValuesSize;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/item/ItemType1_20_5.java

@@ -63,7 +63,7 @@ public class ItemType1_20_5 extends Type<Item> {
             return new Reference2ObjectOpenHashMap<>();
         }
 
-        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>();
+        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>(Math.min(valuesSize + markersSize, 128));
         for (int i = 0; i < valuesSize; i++) {
             final StructuredData<?> value = dataType.read(buffer);
             final StructuredDataKey<?> key = dataType.key(value.id());

api/src/main/java/com/viaversion/viaversion/api/type/types/misc/ParticleType.java

@@ -29,7 +29,6 @@ import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
-import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 import com.viaversion.viaversion.util.Key;
 import io.netty.buffer.ByteBuf;
 
@@ -148,12 +147,19 @@ public class ParticleType extends DynamicType<Particle> {
         public static final DataReader<Particle> COLOR = (buf, particle) -> {
             particle.add(Types.INT, Types.INT.readPrimitive(buf));
         };
-        public static final DataReader<Particle> TRAIL = (buf, particle) -> {
-            particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Target X
-            particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Target Y
-            particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Target Z
+        public static final DataReader<Particle> TRAIL1_21_2 = (buf, particle) -> {
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target X
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Y
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Z
             particle.add(Types.INT, Types.INT.readPrimitive(buf)); // Color
         };
+        public static final DataReader<Particle> TRAIL1_21_4 = (buf, particle) -> {
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target X
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Y
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Z
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // Color
+            particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Duration
+        };
 
         public static DataReader<Particle> item(Type<Item> item) {
             return (buf, particle) -> particle.add(item, item.read(buf));

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_21_2.java

@@ -25,7 +25,7 @@ package com.viaversion.viaversion.api.type.types.version;
 import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.data.StructuredData;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
-import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21_2;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.ArrayType;
@@ -43,14 +43,13 @@ public final class Types1_21_2 {
     public static final StructuredDataType STRUCTURED_DATA = new StructuredDataType();
     public static final Type<StructuredData<?>[]> STRUCTURED_DATA_ARRAY = new ArrayType<>(STRUCTURED_DATA);
     public static final ItemType1_20_5 ITEM = new ItemType1_20_5(STRUCTURED_DATA);
-    public static final Type<Item> OPTIONAL_ITEM = ITEM.new OptionalItemType(); // Optional as in boolean prefixed, not via the amount
     public static final Type<Item[]> ITEM_ARRAY = new ArrayType<>(ITEM);
     public static final Type<Item> ITEM_COST = new ItemCostType1_20_5(STRUCTURED_DATA_ARRAY);
     public static final Type<Item> OPTIONAL_ITEM_COST = new ItemCostType1_20_5.OptionalItemCostType(ITEM_COST);
 
     public static final ParticleType PARTICLE = new ParticleType();
-    public static final ArrayType<Particle> PARTICLES = new ArrayType<>(PARTICLE);
-    public static final EntityDataTypes1_21 ENTITY_DATA_TYPES = new EntityDataTypes1_21(ITEM, PARTICLE, PARTICLES);
+    public static final Type<Particle[]> PARTICLES = new ArrayType<>(PARTICLE);
+    public static final EntityDataTypes1_21_2 ENTITY_DATA_TYPES = new EntityDataTypes1_21_2(ITEM, PARTICLE, PARTICLES);
     public static final Type<EntityData> ENTITY_DATA = new EntityDataType(ENTITY_DATA_TYPES);
     public static final Type<List<EntityData>> ENTITY_DATA_LIST = new EntityDataListType(ENTITY_DATA);
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_21_4.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.version;
+
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataListType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.types.item.ItemCostType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.ItemType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.StructuredDataType;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+import java.util.List;
+
+// Most of these are only safe to use after protocol loading
+public final class Types1_21_4 {
+
+    public static final StructuredDataType STRUCTURED_DATA = new StructuredDataType();
+    public static final Type<StructuredData<?>[]> STRUCTURED_DATA_ARRAY = new ArrayType<>(STRUCTURED_DATA);
+    public static final ItemType1_20_5 ITEM = new ItemType1_20_5(STRUCTURED_DATA);
+    public static final Type<Item[]> ITEM_ARRAY = new ArrayType<>(ITEM);
+    public static final Type<Item> ITEM_COST = new ItemCostType1_20_5(STRUCTURED_DATA_ARRAY);
+    public static final Type<Item> OPTIONAL_ITEM_COST = new ItemCostType1_20_5.OptionalItemCostType(ITEM_COST);
+
+    public static final ParticleType PARTICLE = new ParticleType();
+    public static final ArrayType<Particle> PARTICLES = new ArrayType<>(PARTICLE);
+    public static final EntityDataTypes1_21 ENTITY_DATA_TYPES = new EntityDataTypes1_21(ITEM, PARTICLE, PARTICLES);
+    public static final Type<EntityData> ENTITY_DATA = new EntityDataType(ENTITY_DATA_TYPES);
+    public static final Type<List<EntityData>> ENTITY_DATA_LIST = new EntityDataListType(ENTITY_DATA);
+}

api/src/main/java/com/viaversion/viaversion/exception/InformativeException.java

@@ -22,11 +22,14 @@
  */
 package com.viaversion.viaversion.exception;
 
-import java.util.HashMap;
-import java.util.Map;
+import com.viaversion.viaversion.api.Via;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class InformativeException extends RuntimeException {
-    private final Map<String, Object> info = new HashMap<>();
+    private static final int MAX_MESSAGE_LENGTH = 5_000;
+    private final List<DataEntry> dataEntries = new ArrayList<>();
     private boolean shouldBePrinted = true;
     private int sources;
 
@@ -34,8 +37,8 @@ public class InformativeException extends RuntimeException {
         super(cause);
     }
 
-    public InformativeException set(String key, Object value) {
-        info.put(key, value);
+    public InformativeException set(String key, @Nullable Object value) {
+        dataEntries.add(new DataEntry(key, value));
         return this;
     }
 
@@ -57,14 +60,21 @@ public class InformativeException extends RuntimeException {
 
     @Override
     public String getMessage() {
-        StringBuilder builder = new StringBuilder("Please report this on the Via support Discord or open an issue on the relevant GitHub repository\n");
+        final StringBuilder builder = new StringBuilder("Please report this on the Via support Discord or open an issue on the relevant GitHub repository\n");
         boolean first = true;
-        for (Map.Entry<String, Object> entry : info.entrySet()) {
+        for (final DataEntry entry : dataEntries) {
             if (!first) {
                 builder.append(", ");
+            } else {
+                first = false;
             }
-            builder.append(entry.getKey()).append(": ").append(entry.getValue());
-            first = false;
+
+            builder.append(entry.name()).append(": ");
+            String s = String.valueOf(entry.value());
+            if (!Via.getManager().isDebug() && s.length() > 10 && builder.length() + s.length() > MAX_MESSAGE_LENGTH) {
+                s = s.substring(0, MAX_MESSAGE_LENGTH - builder.length()) + "...";
+            }
+            builder.append(s.replaceAll("\\s", ""));
         }
         return builder.toString();
     }
@@ -74,4 +84,7 @@ public class InformativeException extends RuntimeException {
         // Don't record this stack
         return this;
     }
+
+    private record DataEntry(String name, @Nullable Object value) {
+    }
 }

api/src/main/java/com/viaversion/viaversion/util/Limit.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.util;
+
+public final class Limit {
+
+    public static int max(final int value, final int max) {
+        if (value > max) {
+            throw new IllegalArgumentException("Value " + value + " is higher than the maximum " + max);
+        }
+        return value;
+    }
+}

build-logic/src/main/kotlin/extensions.kt

@@ -1,7 +1,6 @@
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.jvm.toolchain.JavaLanguageVersion
-import java.io.ByteArrayOutputStream
 
 fun Project.latestCommitHash(): String {
     return runGitCommand(listOf("rev-parse", "--short", "HEAD"))
@@ -16,12 +15,9 @@ fun Project.branchName(): String {
 }
 
 fun Project.runGitCommand(args: List<String>): String {
-    val byteOut = ByteArrayOutputStream()
-    exec {
+    return providers.exec {
         commandLine = listOf("git") + args
-        standardOutput = byteOut
-    }
-    return byteOut.toString(Charsets.UTF_8.name()).trim()
+    }.standardOutput.asBytes.get().toString(Charsets.UTF_8).trim()
 }
 
 fun JavaPluginExtension.javaTarget(version: Int) {

build-logic/src/main/kotlin/via.base-conventions.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     `java-library`
+    `jvm-test-suite`
 }
 
 tasks {

build.gradle.kts

@@ -16,10 +16,10 @@ val main = setOf(
     projects.viaversionBukkit,
     projects.viaversionVelocity,
     projects.viaversionFabric
-).map { it.dependencyProject }
+).map { it.path }
 
 subprojects {
-    when (this) {
+    when (path) {
         in main -> plugins.apply("via.shadow-conventions")
         else -> plugins.apply("via.base-conventions")
     }

bukkit/src/main/java/com/viaversion/viaversion/ViaVersionPlugin.java

@@ -33,6 +33,7 @@ import com.viaversion.viaversion.bukkit.platform.BukkitViaInjector;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaLoader;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaTask;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaTaskTask;
+import com.viaversion.viaversion.bukkit.platform.FoliaViaTask;
 import com.viaversion.viaversion.bukkit.platform.PaperViaInjector;
 import com.viaversion.viaversion.dump.PluginInfo;
 import com.viaversion.viaversion.unsupported.UnsupportedPlugin;
@@ -171,11 +172,18 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaPlatform<Player>
 
     @Override
     public PlatformTask runSync(Runnable runnable, long delay) {
+        if (FOLIA) {
+            // Set the delayed tick to at least 1, as Folia requires this.
+            return new FoliaViaTask(getServer().getGlobalRegionScheduler().runDelayed(this, (e) -> runnable.run(), delay <= 0L ? 1L : delay));
+        }
         return new BukkitViaTask(getServer().getScheduler().runTaskLater(this, runnable, delay));
     }
 
     @Override
     public PlatformTask runRepeatingSync(Runnable runnable, long period) {
+        if (FOLIA) {
+            return new FoliaViaTask(getServer().getGlobalRegionScheduler().runAtFixedRate(this, (e) -> runnable.run(), 1, period));
+        }
         return new BukkitViaTask(getServer().getScheduler().runTaskTimer(this, runnable, 0, period));
     }
 

bukkit/src/main/java/com/viaversion/viaversion/bukkit/handlers/BukkitDecodeHandler.java

@@ -22,6 +22,7 @@ import com.viaversion.viaversion.bukkit.util.NMSUtil;
 import com.viaversion.viaversion.exception.CancelCodecException;
 import com.viaversion.viaversion.exception.CancelDecoderException;
 import com.viaversion.viaversion.exception.InformativeException;
+import com.viaversion.viaversion.util.ByteBufUtil;
 import com.viaversion.viaversion.util.PipelineUtil;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
@@ -39,7 +40,7 @@ public final class BukkitDecodeHandler extends MessageToMessageDecoder<ByteBuf>
     }
 
     @Override
-    protected void decode(final ChannelHandlerContext ctx, final ByteBuf bytebuf, final List<Object> out) throws Exception {
+    protected void decode(final ChannelHandlerContext ctx, final ByteBuf bytebuf, final List<Object> out) {
         if (!connection.checkServerboundPacket()) {
             throw CancelDecoderException.generate(null);
         }
@@ -48,7 +49,7 @@ public final class BukkitDecodeHandler extends MessageToMessageDecoder<ByteBuf>
             return;
         }
 
-        final ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(bytebuf);
+        final ByteBuf transformedBuf = ByteBufUtil.copy(ctx.alloc(), bytebuf);
         try {
             connection.transformIncoming(transformedBuf, CancelDecoderException::generate);
             out.add(transformedBuf.retain());

bukkit/src/main/java/com/viaversion/viaversion/bukkit/handlers/BukkitEncodeHandler.java

@@ -22,6 +22,7 @@ import com.viaversion.viaversion.bukkit.util.NMSUtil;
 import com.viaversion.viaversion.exception.CancelCodecException;
 import com.viaversion.viaversion.exception.CancelEncoderException;
 import com.viaversion.viaversion.exception.InformativeException;
+import com.viaversion.viaversion.util.ByteBufUtil;
 import com.viaversion.viaversion.util.PipelineUtil;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
@@ -52,7 +53,7 @@ public final class BukkitEncodeHandler extends MessageToMessageEncoder<ByteBuf>
             return;
         }
 
-        final ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(bytebuf);
+        final ByteBuf transformedBuf = ByteBufUtil.copy(ctx.alloc(), bytebuf);
         try {
             final boolean needsCompression = !handledCompression && handleCompressionOrder(ctx, transformedBuf);
             connection.transformClientbound(transformedBuf, CancelEncoderException::generate);

bukkit/src/main/java/com/viaversion/viaversion/bukkit/listeners/v1_20_5to1_21/LegacyChangeItemListener.java

@@ -0,0 +1,72 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21;
+
+import com.viaversion.viaversion.ViaVersionPlugin;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.protocols.v1_20_5to1_21.storage.EfficiencyAttributeStorage;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.BlockDamageEvent;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+
+public class LegacyChangeItemListener extends PlayerChangeItemListener {
+
+    public LegacyChangeItemListener(final ViaVersionPlugin plugin) {
+        super(plugin);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onBlockDamageEvent(final BlockDamageEvent event) {
+        final Player player = event.getPlayer();
+        final ItemStack item = event.getItemInHand();
+        sendAttributeUpdate(player, item, Slot.HAND);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onInventoryClose(final InventoryCloseEvent event) {
+        if (event.getPlayer() instanceof Player player &&
+            (event.getInventory().getType() == InventoryType.CRAFTING ||
+                event.getInventory().getType() == InventoryType.PLAYER)) {
+            sendArmorUpdate(player);
+        }
+    }
+
+    private void sendArmorUpdate(final Player player) {
+        final UserConnection connection = getUserConnection(player);
+        final EfficiencyAttributeStorage storage = getEfficiencyStorage(connection);
+        if (storage == null) {
+            return;
+        }
+
+        final PlayerInventory inventory = player.getInventory();
+        final ItemStack helmet = inventory.getHelmet();
+        final ItemStack leggings = swiftSneak != null ? inventory.getLeggings() : null;
+        final ItemStack boots = depthStrider != null ? inventory.getBoots() : null;
+
+        storage.setEnchants(player.getEntityId(), connection, storage.activeEnchants()
+            .aquaAffinity(helmet != null ? helmet.getEnchantmentLevel(aquaAffinity) : 0)
+            .swiftSneak(leggings != null ? leggings.getEnchantmentLevel(swiftSneak) : 0)
+            .depthStrider(boots != null ? boots.getEnchantmentLevel(depthStrider) : 0));
+    }
+
+}

bukkit/src/main/java/com/viaversion/viaversion/bukkit/listeners/v1_20_5to1_21/PlayerChangeItemListener.java

@@ -18,7 +18,6 @@
 package com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21;
 
 import com.viaversion.viaversion.ViaVersionPlugin;
-import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.Protocol1_20_5To1_21;
@@ -38,11 +37,11 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public class PlayerChangeItemListener extends ViaBukkitListener {
 
     // Use legacy function and names here to support all versions
-    private final Enchantment efficiency = getByName("efficiency", "DIG_SPEED");
-    private final Enchantment aquaAffinity = getByName("aqua_affinity", "WATER_WORKER");
-    private final Enchantment depthStrider = getByName("depth_strider", "DEPTH_STRIDER");
-    private final Enchantment soulSpeed = getByName("soul_speed", "SOUL_SPEED");
-    private final Enchantment swiftSneak = getByName("swift_sneak", "SWIFT_SNEAK");
+    protected final Enchantment efficiency = getByName("efficiency", "DIG_SPEED");
+    protected final Enchantment aquaAffinity = getByName("aqua_affinity", "WATER_WORKER");
+    protected final Enchantment depthStrider = getByName("depth_strider", "DEPTH_STRIDER");
+    protected final Enchantment soulSpeed = getByName("soul_speed", "SOUL_SPEED");
+    protected final Enchantment swiftSneak = getByName("swift_sneak", "SWIFT_SNEAK");
 
     public PlayerChangeItemListener(final ViaVersionPlugin plugin) {
         super(plugin, Protocol1_20_5To1_21.class);
@@ -55,35 +54,26 @@ public class PlayerChangeItemListener extends ViaBukkitListener {
         sendAttributeUpdate(player, item, Slot.HAND);
     }
 
+    protected EfficiencyAttributeStorage getEfficiencyStorage(final UserConnection connection) {
+        return connection != null ? connection.get(EfficiencyAttributeStorage.class) : null;
+    }
+
     void sendAttributeUpdate(final Player player, @Nullable final ItemStack item, final Slot slot) {
-        final UserConnection connection = Via.getAPI().getConnection(player.getUniqueId());
-        if (connection == null || !isOnPipe(player)) {
-            return;
-        }
+        final UserConnection connection = getUserConnection(player);
+        final EfficiencyAttributeStorage storage = getEfficiencyStorage(connection);
+        if (storage == null) return;
 
-        final EfficiencyAttributeStorage storage = connection.get(EfficiencyAttributeStorage.class);
-        if (storage == null) {
-            return;
-        }
-
-        final EfficiencyAttributeStorage.ActiveEnchants activeEnchants = storage.activeEnchants();
-        int efficiencyLevel = activeEnchants.efficiency().level();
-        int aquaAffinityLevel = activeEnchants.aquaAffinity().level();
-        int soulSpeedLevel = activeEnchants.soulSpeed().level();
-        int swiftSneakLevel = activeEnchants.swiftSneak().level();
-        int depthStriderLevel = activeEnchants.depthStrider().level();
-        switch (slot) {
-            case HAND -> efficiencyLevel = item != null ? item.getEnchantmentLevel(efficiency) : 0;
-            case HELMET -> aquaAffinityLevel = item != null ? item.getEnchantmentLevel(aquaAffinity) : 0;
-            case LEGGINGS -> swiftSneakLevel = item != null && swiftSneak != null ? item.getEnchantmentLevel(swiftSneak) : 0;
-            case BOOTS -> {
-                depthStriderLevel = item != null && depthStrider != null ? item.getEnchantmentLevel(depthStrider) : 0;
-                // TODO This needs continuous ticking for the supporting block as a conditional effect
-                //  and is even more prone to desync from high ping than the other attributes
-                //soulSpeedLevel = item != null && soulSpeed != null ? item.getEnchantmentLevel(soulSpeed) : 0;
-            }
-        }
-        storage.setEnchants(player.getEntityId(), connection, efficiencyLevel, soulSpeedLevel, swiftSneakLevel, aquaAffinityLevel, depthStriderLevel);
+        EfficiencyAttributeStorage.ActiveEnchants enchants = storage.activeEnchants();
+        enchants = switch (slot) {
+            case HAND -> enchants.efficiency(item != null ? item.getEnchantmentLevel(efficiency) : 0);
+            case HELMET -> enchants.aquaAffinity(item != null ? item.getEnchantmentLevel(aquaAffinity) : 0);
+            case LEGGINGS -> enchants.swiftSneak(item != null && swiftSneak != null ? item.getEnchantmentLevel(swiftSneak) : 0);
+            case BOOTS -> enchants.depthStrider(item != null && depthStrider != null ? item.getEnchantmentLevel(depthStrider) : 0);
+            // TODO This needs continuous ticking for the supporting block as a conditional effect
+            //  and is even more prone to desync from high ping than the other attributes
+            //soulSpeedLevel = item != null && soulSpeed != null ? item.getEnchantmentLevel(soulSpeed) : 0;
+        };
+        storage.setEnchants(player.getEntityId(), connection, enchants);
     }
 
     enum Slot {

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/BukkitViaLoader.java

@@ -26,23 +26,25 @@ import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.bukkit.listeners.UpdateListener;
 import com.viaversion.viaversion.bukkit.listeners.multiversion.PlayerSneakListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_14_4to1_15.EntityToggleGlideListener;
-import com.viaversion.viaversion.bukkit.listeners.v1_19_3to1_19_4.ArmorToggleListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_18_2to1_19.BlockBreakListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_19_3to1_19_4.ArmorToggleListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.LegacyChangeItemListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PaperPlayerChangeItemListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.ArmorListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.BlockListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.DeathListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.HandItemCache;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.PaperPatch;
-import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PaperPlayerChangeItemListener;
-import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PlayerChangeItemListener;
 import com.viaversion.viaversion.bukkit.providers.BukkitAckSequenceProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitBlockConnectionProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitInventoryQuickMoveProvider;
+import com.viaversion.viaversion.bukkit.providers.BukkitPickItemProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitViaMovementTransmitter;
 import com.viaversion.viaversion.protocols.v1_11_1to1_12.provider.InventoryQuickMoveProvider;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.blockconnections.ConnectionData;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.blockconnections.providers.BlockConnectionProvider;
 import com.viaversion.viaversion.protocols.v1_18_2to1_19.provider.AckSequenceProvider;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.provider.PickItemProvider;
 import com.viaversion.viaversion.protocols.v1_8to1_9.provider.HandItemProvider;
 import com.viaversion.viaversion.protocols.v1_8to1_9.provider.MovementTransmitterProvider;
 import java.util.HashSet;
@@ -184,7 +186,12 @@ public class BukkitViaLoader implements ViaPlatformLoader {
             if (PaperViaInjector.hasClass("io.papermc.paper.event.player.PlayerInventorySlotChangeEvent")) {
                 new PaperPlayerChangeItemListener(plugin).register();
             } else {
-                new PlayerChangeItemListener(plugin).register();
+                new LegacyChangeItemListener(plugin).register();
+            }
+        }
+        if (serverProtocolVersion.olderThan(ProtocolVersion.v1_21_4)) {
+            if (PaperViaInjector.hasMethod(Material.class, "isItem")) {
+                Via.getManager().getProviders().use(PickItemProvider.class, new BukkitPickItemProvider(plugin));
             }
         }
     }

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/FoliaViaTask.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.platform;
+
+import com.viaversion.viaversion.api.platform.PlatformTask;
+import io.papermc.paper.threadedregions.scheduler.ScheduledTask;
+
+public record FoliaViaTask(ScheduledTask task) implements PlatformTask<ScheduledTask> {
+    @Override
+    public void cancel() {
+        task.cancel();
+    }
+}

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/PaperViaInjector.java

@@ -65,12 +65,7 @@ public final class PaperViaInjector {
     }
 
     private static boolean hasServerProtocolMethod() {
-        try {
-            Class.forName("org.bukkit.UnsafeValues").getDeclaredMethod("getProtocolVersion");
-            return true;
-        } catch (final ClassNotFoundException | NoSuchMethodException e) {
-            return false;
-        }
+        return hasMethod("org.bukkit.UnsafeValues", "getProtocolVersion");
     }
 
     private static boolean hasPaperInjectionMethod() {
@@ -78,12 +73,7 @@ public final class PaperViaInjector {
     }
 
     private static boolean hasIsStoppingMethod() {
-        try {
-            Bukkit.class.getDeclaredMethod("isStopping");
-            return true;
-        } catch (final NoSuchMethodException e) {
-            return false;
-        }
+        return hasMethod(Bukkit.class, "isStopping");
     }
 
     private static boolean hasPacketLimiter() {
@@ -98,4 +88,22 @@ public final class PaperViaInjector {
             return false;
         }
     }
+
+    public static boolean hasMethod(final String className, final String method) {
+        try {
+            Class.forName(className).getDeclaredMethod(method);
+            return true;
+        } catch (final ClassNotFoundException | NoSuchMethodException e) {
+            return false;
+        }
+    }
+
+    public static boolean hasMethod(final Class<?> clazz, final String method) {
+        try {
+            clazz.getDeclaredMethod(method);
+            return true;
+        } catch (final NoSuchMethodException e) {
+            return false;
+        }
+    }
 }

bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitPickItemProvider.java

@@ -0,0 +1,182 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.providers;
+
+import com.viaversion.viaversion.ViaVersionPlugin;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.BlockPosition;
+import com.viaversion.viaversion.bukkit.platform.PaperViaInjector;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.provider.PickItemProvider;
+import java.util.UUID;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemFactory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.inventory.meta.BlockStateMeta;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class BukkitPickItemProvider extends PickItemProvider {
+    private static final boolean HAS_PLACEMENT_MATERIAL_METHOD = PaperViaInjector.hasMethod("org.bukkit.block.BlockData", "getPlacementMaterial");
+    private static final boolean HAS_SPAWN_EGG_METHOD = PaperViaInjector.hasMethod(ItemFactory.class, "getSpawnEgg");
+    private static final double BLOCK_RANGE = 4.5 + 1;
+    private static final double BLOCK_RANGE_SQUARED = BLOCK_RANGE * BLOCK_RANGE;
+    private static final double ENTITY_RANGE = 3 + 3;
+    private final ViaVersionPlugin plugin;
+
+    public BukkitPickItemProvider(final ViaVersionPlugin plugin) {
+        this.plugin = plugin;
+    }
+
+    @Override
+    public void pickItemFromBlock(final UserConnection connection, final BlockPosition blockPosition, final boolean includeData) {
+        final UUID uuid = connection.getProtocolInfo().getUuid();
+        plugin.getServer().getScheduler().runTask(plugin, () -> {
+            final Player player = plugin.getServer().getPlayer(uuid);
+            if (player == null) {
+                return;
+            }
+
+            final Location playerLocation = player.getLocation();
+            if (blockPosition.distanceFromCenterSquared(playerLocation.getX(), playerLocation.getY(), playerLocation.getZ()) > BLOCK_RANGE_SQUARED) {
+                return;
+            }
+
+            final Block block = player.getWorld().getBlockAt(blockPosition.x(), blockPosition.y(), blockPosition.z());
+            if (block.getType() == Material.AIR) {
+                return;
+            }
+
+            final ItemStack item = blockToItem(block, includeData && player.getGameMode() == GameMode.CREATIVE);
+            if (item != null) {
+                pickItem(player, item);
+            }
+        });
+    }
+
+    private @Nullable ItemStack blockToItem(final Block block, final boolean includeData) {
+        if (HAS_PLACEMENT_MATERIAL_METHOD) {
+            final ItemStack item = new ItemStack(block.getBlockData().getPlacementMaterial(), 1);
+            if (includeData && item.getItemMeta() instanceof final BlockStateMeta blockStateMeta) {
+                blockStateMeta.setBlockState(block.getState());
+            }
+            return item;
+        } else if (block.getType().isItem()) {
+            return new ItemStack(block.getType(), 1);
+        }
+        return null;
+    }
+
+    @Override
+    public void pickItemFromEntity(final UserConnection connection, final int entityId, final boolean includeData) {
+        if (!HAS_SPAWN_EGG_METHOD) {
+            return;
+        }
+
+        final UUID uuid = connection.getProtocolInfo().getUuid();
+        plugin.getServer().getScheduler().runTask(plugin, () -> {
+            final Player player = plugin.getServer().getPlayer(uuid);
+            if (player == null) {
+                return;
+            }
+
+            final Entity entity = player.getWorld().getNearbyEntities(player.getLocation(), ENTITY_RANGE, ENTITY_RANGE, ENTITY_RANGE).stream()
+                .filter(e -> e.getEntityId() == entityId)
+                .findAny()
+                .orElse(null);
+            if (entity == null) {
+                return;
+            }
+
+            final Material spawnEggType = Bukkit.getItemFactory().getSpawnEgg(entity.getType());
+            if (spawnEggType != null) {
+                pickItem(player, new ItemStack(spawnEggType, 1));
+            }
+        });
+    }
+
+    private void pickItem(final Player player, final ItemStack item) {
+        // Find matching item
+        final PlayerInventory inventory = player.getInventory();
+        final ItemStack[] contents = inventory.getStorageContents();
+        int sourceSlot = -1;
+        for (int i = 0; i < contents.length; i++) {
+            final ItemStack content = contents[i];
+            if (content == null || !content.isSimilar(item)) {
+                continue;
+            }
+
+            sourceSlot = i;
+            break;
+        }
+
+        if (sourceSlot != -1) {
+            moveToHotbar(inventory, sourceSlot, contents);
+        } else if (player.getGameMode() == GameMode.CREATIVE) {
+            spawnItem(item, inventory, contents);
+        }
+    }
+
+    private void spawnItem(final ItemStack item, final PlayerInventory inventory, final ItemStack[] contents) {
+        final int targetSlot = findEmptyHotbarSlot(inventory, inventory.getHeldItemSlot());
+        inventory.setHeldItemSlot(targetSlot);
+        final ItemStack heldItem = inventory.getItem(targetSlot);
+        int emptySlot = targetSlot;
+        if (heldItem != null && heldItem.getType() != Material.AIR) {
+            // Swap to the first free slot in the inventory, else add it to the current hotbar slot
+            for (int i = 0; i < contents.length; i++) {
+                if (contents[i] == null || contents[i].getType() == Material.AIR) {
+                    emptySlot = i;
+                    break;
+                }
+            }
+        }
+
+        inventory.setItem(emptySlot, heldItem);
+        inventory.setItemInMainHand(item);
+    }
+
+    private void moveToHotbar(final PlayerInventory inventory, final int sourceSlot, final ItemStack[] contents) {
+        if (sourceSlot <= 9) {
+            inventory.setHeldItemSlot(sourceSlot);
+            return;
+        }
+
+        final int heldSlot = inventory.getHeldItemSlot();
+        final int targetSlot = findEmptyHotbarSlot(inventory, heldSlot);
+        inventory.setHeldItemSlot(targetSlot);
+        final ItemStack heldItem = inventory.getItem(targetSlot);
+        inventory.setItemInMainHand(contents[sourceSlot]);
+        inventory.setItem(sourceSlot, heldItem);
+    }
+
+    private int findEmptyHotbarSlot(final PlayerInventory inventory, final int heldSlot) {
+        for (int i = 0; i < 9; i++) {
+            final ItemStack item = inventory.getItem(i);
+            if (item == null || item.getType() == Material.AIR) {
+                return i;
+            }
+        }
+        return heldSlot;
+    }
+}

common/build.gradle.kts

@@ -18,3 +18,32 @@ java {
 tasks.named<Jar>("sourcesJar") {
     from(project(":viaversion-api").sourceSets.main.get().allSource)
 }
+
+// Task to quickly test/debug code changes using https://github.com/ViaVersion/ViaProxy
+// For further instructions see the ViaProxy repository README
+tasks.register<JavaExec>("runViaProxy") {
+    dependsOn(tasks.shadowJar)
+
+    val viaProxyConfiguration = configurations.create("viaProxy")
+    viaProxyConfiguration.dependencies.add(dependencies.create(rootProject.libs.viaProxy.get().copy().setTransitive(false)))
+
+    mainClass.set("net.raphimc.viaproxy.ViaProxy")
+    classpath = viaProxyConfiguration
+    workingDir = file("run")
+    jvmArgs = listOf("-DskipUpdateCheck")
+
+    if (System.getProperty("viaproxy.gui.autoStart") != null) {
+        jvmArgs("-Dviaproxy.gui.autoStart")
+    }
+
+    doFirst {
+        val jarsDir = file("$workingDir/jars")
+        jarsDir.mkdirs()
+        file("$jarsDir/${project.name}.jar").writeBytes(tasks.shadowJar.get().archiveFile.get().asFile.readBytes())
+    }
+
+    doLast {
+        file("$workingDir/jars/${project.name}.jar").delete()
+        file("$workingDir/logs").deleteRecursively()
+    }
+}

common/src/main/java/com/viaversion/viaversion/ViaListener.java

@@ -48,7 +48,10 @@ public abstract class ViaListener {
      * @return True if on pipe
      */
     protected boolean isOnPipe(UUID uuid) {
-        UserConnection userConnection = getUserConnection(uuid);
+        return isOnPipe(getUserConnection(uuid));
+    }
+
+    protected boolean isOnPipe(UserConnection userConnection) {
         return userConnection != null &&
             (requiredPipeline == null || userConnection.getProtocolInfo().getPipeline().contains(requiredPipeline));
     }

common/src/main/java/com/viaversion/viaversion/ViaManagerImpl.java

@@ -244,9 +244,12 @@ public class ViaManagerImpl implements ViaManager {
         }
 
         if (version < 17) {
-            platform.getLogger().warning("You are running an outdated Java version, please update it to at least Java 17 (your version is " + javaVersion + ").");
+            platform.getLogger().warning("You are running an outdated Java version, please update it to at least Java 21 (your version is " + javaVersion + ").");
             platform.getLogger().warning("ViaVersion no longer officially supports this version of Java, only offering unsupported compatibility builds.");
             platform.getLogger().warning("See https://github.com/ViaVersion/ViaVersion/releases/tag/5.0.0 for more information.");
+        } else if (version < 21) {
+            platform.getLogger().warning("Please update your Java runtime to at least Java 21 (your version is " + javaVersion + ").");
+            platform.getLogger().warning("At some point in the future, ViaVersion will no longer be compatible with this version of Java.");
         }
     }
 

common/src/main/java/com/viaversion/viaversion/commands/defaultsubs/ReloadSubCmd.java

@@ -35,7 +35,7 @@ public class ReloadSubCmd implements ViaSubCommand {
     @Override
     public boolean execute(ViaCommandSender sender, String[] args) {
         Via.getManager().getConfigurationProvider().reloadConfigs();
-        sendMessage(sender, "&6Configuration successfully reloaded! Some features may need a restart.");
+        sendMessage(sender, "&6Configuration successfully reloaded! Some config options may require a restart to take effect.");
         return true;
     }
 }

common/src/main/java/com/viaversion/viaversion/configuration/AbstractViaConfig.java

@@ -96,6 +96,7 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
     private boolean cancelBlockSounds;
     private boolean hideScoreboardNumbers;
     private boolean fix1_21PlacementRotation;
+    private boolean swordBlockingViaConsumable;
 
     protected AbstractViaConfig(final File configFile, final Logger logger) {
         super(configFile, logger);
@@ -164,7 +165,8 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
         handleInvalidItemCount = getBoolean("handle-invalid-item-count", false);
         cancelBlockSounds = getBoolean("cancel-block-sounds", true);
         hideScoreboardNumbers = getBoolean("hide-scoreboard-numbers", false);
-        fix1_21PlacementRotation = getBoolean("fix-1_21-placement-rotation", false);
+        fix1_21PlacementRotation = getBoolean("fix-1_21-placement-rotation", true);
+        swordBlockingViaConsumable = getBoolean("sword-blocking-via-consumable", true);
     }
 
     private BlockedProtocolVersions loadBlockedProtocolVersions() {
@@ -556,4 +558,9 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
     public boolean fix1_21PlacementRotation() {
         return fix1_21PlacementRotation;
     }
+
+    @Override
+    public boolean swordBlockingViaConsumable() {
+        return swordBlockingViaConsumable;
+    }
 }

common/src/main/java/com/viaversion/viaversion/connection/UserConnectionImpl.java

@@ -29,8 +29,8 @@ import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.Direction;
 import com.viaversion.viaversion.api.protocol.packet.PacketTracker;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
-import com.viaversion.viaversion.api.protocol.packet.State;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.VarIntType;
 import com.viaversion.viaversion.exception.CancelException;
 import com.viaversion.viaversion.exception.InformativeException;
 import com.viaversion.viaversion.protocol.packet.PacketWrapperImpl;
@@ -55,6 +55,7 @@ import java.util.function.Function;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class UserConnectionImpl implements UserConnection {
+    private static final int PASSTHROUGH_DATA_BYTES = Long.BYTES * 2 + 2;
     private static final AtomicLong IDS = new AtomicLong();
     private final long id = IDS.incrementAndGet();
     private final Map<Class<?>, StorableObject> storedObjects = new ConcurrentHashMap<>();
@@ -244,7 +245,8 @@ public class UserConnectionImpl implements UserConnection {
     }
 
     private void sendRawPacketToServerServerSide(final ByteBuf packet, final boolean currentThread) {
-        final ByteBuf buf = packet.alloc().buffer();
+        final int initialCapacity = active ? packet.readableBytes() + PASSTHROUGH_DATA_BYTES : packet.readableBytes();
+        final ByteBuf buf = packet.alloc().buffer(initialCapacity);
         try {
             // We'll use passing through because there are some encoder wrappers
             ChannelHandlerContext context = PipelineUtil
@@ -333,7 +335,7 @@ public class UserConnectionImpl implements UserConnection {
             return;
         }
 
-        int id = Types.VAR_INT.readPrimitive(buf);
+        final int id = Types.VAR_INT.readPrimitive(buf);
         if (id == PacketWrapper.PASSTHROUGH_ID) {
             if (!passthroughTokens.remove(Types.UUID.read(buf))) {
                 throw new IllegalArgumentException("Invalid token");
@@ -341,20 +343,47 @@ public class UserConnectionImpl implements UserConnection {
             return;
         }
 
-        PacketWrapper wrapper = new PacketWrapperImpl(id, buf, this);
-        State state = protocolInfo.getState(direction);
+        final int valuesReaderIndex = buf.readerIndex();
+        final PacketWrapperImpl wrapper = new PacketWrapperImpl(id, buf, this);
         try {
-            protocolInfo.getPipeline().transform(direction, state, wrapper);
-        } catch (CancelException ex) {
+            protocolInfo.getPipeline().transform(direction, protocolInfo.getState(direction), wrapper);
+        } catch (final CancelException ex) {
             throw cancelSupplier.apply(ex);
         }
 
-        ByteBuf transformed = buf.alloc().buffer();
+        writeToBuffer(wrapper, buf, id, valuesReaderIndex);
+    }
+
+    private void writeToBuffer(final PacketWrapperImpl wrapper, final ByteBuf buf, final int originalId, final int originalReaderIndex) {
+        final int remainingBytes = buf.readableBytes();
+        if (buf.readerIndex() == originalReaderIndex && wrapper.areStoredPacketValuesEmpty()) {
+            if (wrapper.getId() == originalId) {
+                // No changes needed; just set the reader and writer indexes and we're done
+                buf.setIndex(0, originalReaderIndex + remainingBytes);
+                return;
+            }
+            if (VarIntType.varIntLength(wrapper.getId()) == VarIntType.varIntLength(originalId)) {
+                // If the var int encoded length is the same, simply replace the id at the head
+                buf.setIndex(0, 0);
+                Types.VAR_INT.writePrimitive(buf, wrapper.getId());
+                buf.writerIndex(originalReaderIndex + remainingBytes);
+                return;
+            }
+        }
+
+        // Instead of allocating a possible unnecessarily large buffer to write the wrapper contents to,
+        // only allocate the remaining bytes and write the rest to the original buf's head directly.
+        final ByteBuf remainingBuf = buf.alloc().buffer(remainingBytes, remainingBytes);
         try {
-            wrapper.writeToBuffer(transformed);
-            buf.clear().writeBytes(transformed);
+            // Copy before modifying the buffer
+            remainingBuf.writeBytes(buf, remainingBytes);
+
+            // Reset indexes, write wrapper contents, then the unread bytes
+            buf.setIndex(0, 0);
+            wrapper.writeProcessedValues(buf);
+            buf.writeBytes(remainingBuf);
         } finally {
-            transformed.release();
+            remainingBuf.release();
         }
     }
 

common/src/main/java/com/viaversion/viaversion/protocol/ProtocolManagerImpl.java

@@ -76,6 +76,7 @@ import com.viaversion.viaversion.protocols.v1_20_2to1_20_3.Protocol1_20_2To1_20_
 import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.Protocol1_20_3To1_20_5;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.Protocol1_20_5To1_21;
 import com.viaversion.viaversion.protocols.v1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.Protocol1_21_2To1_21_4;
 import com.viaversion.viaversion.protocols.v1_21to1_21_2.Protocol1_21To1_21_2;
 import com.viaversion.viaversion.protocols.v1_8to1_9.Protocol1_8To1_9;
 import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.Protocol1_9_1To1_9_3;
@@ -194,6 +195,7 @@ public class ProtocolManagerImpl implements ProtocolManager {
 
         registerProtocol(new Protocol1_20_5To1_21(), ProtocolVersion.v1_21, ProtocolVersion.v1_20_5);
         registerProtocol(new Protocol1_21To1_21_2(), ProtocolVersion.v1_21_2, ProtocolVersion.v1_21);
+        registerProtocol(new Protocol1_21_2To1_21_4(), ProtocolVersion.v1_21_4, ProtocolVersion.v1_21_2);
     }
 
     @Override

common/src/main/java/com/viaversion/viaversion/protocol/packet/PacketWrapperImpl.java

@@ -222,6 +222,18 @@ public class PacketWrapperImpl implements PacketWrapper {
 
     @Override
     public void writeToBuffer(ByteBuf buffer) throws InformativeException {
+        writeProcessedValues(buffer);
+        if (inputBuffer != null) {
+            buffer.writeBytes(inputBuffer);
+        }
+    }
+
+    public boolean areStoredPacketValuesEmpty() {
+        // Check for read/added packet values, not the input buffer
+        return packetValues.isEmpty() && readableObjects.isEmpty();
+    }
+
+    public void writeProcessedValues(ByteBuf buffer) throws InformativeException {
         if (id != -1) {
             Types.VAR_INT.writePrimitive(buffer, id);
         }
@@ -238,16 +250,15 @@ public class PacketWrapperImpl implements PacketWrapper {
                 throw createInformativeException(e, packetValue.type(), i);
             }
         }
-        writeRemaining(buffer);
     }
 
     private InformativeException createInformativeException(final Exception cause, final Type<?> type, final int index) {
         return new InformativeException(cause)
+            .set("Packet Type", this.packetType)
             .set("Index", index)
             .set("Type", type.getTypeName())
-            .set("Packet ID", this.id)
-            .set("Packet Type", this.packetType)
-            .set("Data", this.packetValues);
+            .set("Data", this.packetValues)
+            .set("Packet ID", this.id);
     }
 
     @Override
@@ -264,12 +275,6 @@ public class PacketWrapperImpl implements PacketWrapper {
         packetValues.clear();
     }
 
-    private void writeRemaining(ByteBuf output) {
-        if (inputBuffer != null) {
-            output.writeBytes(inputBuffer);
-        }
-    }
-
     @Override
     public void send(Class<? extends Protocol> protocol, boolean skipCurrentPipeline) throws InformativeException {
         send0(protocol, skipCurrentPipeline, true);
@@ -320,7 +325,7 @@ public class PacketWrapperImpl implements PacketWrapper {
         final ProtocolInfo protocolInfo = user().getProtocolInfo();
         final List<Protocol> protocols = protocolInfo.getPipeline().pipes(protocolClass, skipCurrentPipeline, direction);
         apply(direction, protocolInfo.getState(direction), protocols);
-        final ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        final ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             return output.retain();
@@ -354,7 +359,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return cancelledFuture();
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             return user().sendRawPacketFuture(output.retain());
@@ -373,7 +378,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return;
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             if (currentThread) {
@@ -386,6 +391,14 @@ public class PacketWrapperImpl implements PacketWrapper {
         }
     }
 
+    private ByteBuf allocateOutputBuffer() {
+        if (inputBuffer == null) {
+            return user().getChannel().alloc().buffer();
+        }
+        // May have already been partially or fully read
+        return inputBuffer.alloc().buffer(Math.max(inputBuffer.readableBytes(), 256));
+    }
+
     private ChannelFuture cancelledFuture() {
         return user().getChannel().newFailedFuture(new RuntimeException("Tried to send cancelled packet"));
     }
@@ -454,7 +467,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return;
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             if (currentThread) {

common/src/main/java/com/viaversion/viaversion/protocols/template/BlockItemPacketRewriter1_99.java

@@ -18,27 +18,26 @@
 package com.viaversion.viaversion.protocols.template;
 
 import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_20_2;
-import com.viaversion.viaversion.api.type.types.version.Types1_21;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPacket1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPackets1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
-import com.viaversion.viaversion.rewriter.RecipeDisplayRewriter;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPacket1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPackets1_21_4;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.BlockRewriter;
+import com.viaversion.viaversion.rewriter.RecipeDisplayRewriter;
 import com.viaversion.viaversion.rewriter.StructuredItemRewriter;
 
 // To replace if needed:
 //   ChunkType1_20_2
-//   RecipeRewriter1_20_3
-//   Types1_21, Types1_OLD
-final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<ClientboundPacket1_21, ServerboundPacket1_20_5, Protocol1_99To_98> {
+//   RecipeDisplayRewriter
+//   Types1_21_4, Types1_OLD
+final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<ClientboundPacket1_21_2, ServerboundPacket1_21_4, Protocol1_99To_98> {
 
     public BlockItemPacketRewriter1_99(final Protocol1_99To_98 protocol) {
-        super(protocol, Types1_21.ITEM, Types1_21.ITEM_ARRAY);
+        super(protocol, Types1_21_4.ITEM, Types1_21_4.ITEM_ARRAY);
         /*super(protocol,
-            Types1_OLD.ITEM, Types1_OLD.ITEM_ARRAY, Types1_21.ITEM, Types1_21.ITEM_ARRAY,
-            Types1_OLD.ITEM_COST, Types1_OLD.OPTIONAL_ITEM_COST, Types1_21.ITEM_COST, Types1_21.OPTIONAL_ITEM_COST,
-            Types1_OLD.PARTICLE, Types1_21.PARTICLE
+            Types1_OLD.ITEM, Types1_OLD.ITEM_ARRAY, Types1_21_4.ITEM, Types1_21_4.ITEM_ARRAY,
+            Types1_OLD.ITEM_COST, Types1_OLD.OPTIONAL_ITEM_COST, Types1_21_4.ITEM_COST, Types1_21_4.OPTIONAL_ITEM_COST
         );*/
     }
 
@@ -47,33 +46,32 @@ final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<Clientbou
         // Register block and block state id changes
         // Other places using block state id mappings: Spawn particle, entity data, entity spawn (falling blocks)
         // Tags and statistics use block (!) ids
-        final BlockRewriter<ClientboundPacket1_21> blockRewriter = BlockRewriter.for1_20_2(protocol);
-        blockRewriter.registerBlockEvent(ClientboundPackets1_21.BLOCK_EVENT);
-        blockRewriter.registerBlockUpdate(ClientboundPackets1_21.BLOCK_UPDATE);
-        blockRewriter.registerSectionBlocksUpdate1_20(ClientboundPackets1_21.SECTION_BLOCKS_UPDATE);
-        blockRewriter.registerLevelEvent1_21(ClientboundPackets1_21.LEVEL_EVENT, 2001);
-        blockRewriter.registerLevelChunk1_19(ClientboundPackets1_21.LEVEL_CHUNK_WITH_LIGHT, ChunkType1_20_2::new);
-        blockRewriter.registerBlockEntityData(ClientboundPackets1_21.BLOCK_ENTITY_DATA);
+        final BlockRewriter<ClientboundPacket1_21_2> blockRewriter = BlockRewriter.for1_20_2(protocol);
+        blockRewriter.registerBlockEvent(ClientboundPackets1_21_2.BLOCK_EVENT);
+        blockRewriter.registerBlockUpdate(ClientboundPackets1_21_2.BLOCK_UPDATE);
+        blockRewriter.registerSectionBlocksUpdate1_20(ClientboundPackets1_21_2.SECTION_BLOCKS_UPDATE);
+        blockRewriter.registerLevelEvent1_21(ClientboundPackets1_21_2.LEVEL_EVENT, 2001);
+        blockRewriter.registerLevelChunk1_19(ClientboundPackets1_21_2.LEVEL_CHUNK_WITH_LIGHT, ChunkType1_20_2::new);
+        blockRewriter.registerBlockEntityData(ClientboundPackets1_21_2.BLOCK_ENTITY_DATA);
 
         // Registers item id changes
         // Other places using item ids are: Entity data, tags, statistics, effect
-        // registerOpenScreen(ClientboundPackets1_21.OPEN_SCREEN); If a new container type was added; also remove from the component rewriter registration
-        //protocol.registerClientbound(ClientboundPackets1_21_2.SET_CURSOR_ITEM, this::passthroughClientboundItem);
-        registerCooldown1_21_2(ClientboundPackets1_21.COOLDOWN);
-        registerSetContent1_21_2(ClientboundPackets1_21.CONTAINER_SET_CONTENT);
-        registerSetSlot1_21_2(ClientboundPackets1_21.CONTAINER_SET_SLOT);
-        registerAdvancements1_20_3(ClientboundPackets1_21.UPDATE_ADVANCEMENTS);
-        registerSetEquipment(ClientboundPackets1_21.SET_EQUIPMENT);
-        registerContainerClick1_21_2(ServerboundPackets1_20_5.CONTAINER_CLICK);
-        registerMerchantOffers1_20_5(ClientboundPackets1_21.MERCHANT_OFFERS);
-        registerSetCreativeModeSlot(ServerboundPackets1_20_5.SET_CREATIVE_MODE_SLOT);
-        registerLevelParticles1_20_5(ClientboundPackets1_21.LEVEL_PARTICLES);
-        registerExplosion1_21_2(ClientboundPackets1_21.EXPLODE); // Rewrites the included sound and particles
+        // registerOpenScreen(ClientboundPackets1_21_2.OPEN_SCREEN); If a new container type was added; also remove from the component rewriter registration
+        protocol.registerClientbound(ClientboundPackets1_21_2.SET_CURSOR_ITEM, this::passthroughClientboundItem);
+        registerSetPlayerInventory(ClientboundPackets1_21_2.SET_PLAYER_INVENTORY);
+        registerCooldown1_21_2(ClientboundPackets1_21_2.COOLDOWN);
+        registerSetContent1_21_2(ClientboundPackets1_21_2.CONTAINER_SET_CONTENT);
+        registerSetSlot1_21_2(ClientboundPackets1_21_2.CONTAINER_SET_SLOT);
+        registerAdvancements1_20_3(ClientboundPackets1_21_2.UPDATE_ADVANCEMENTS);
+        registerSetEquipment(ClientboundPackets1_21_2.SET_EQUIPMENT);
+        registerMerchantOffers1_20_5(ClientboundPackets1_21_2.MERCHANT_OFFERS);
+        registerContainerClick1_21_2(ServerboundPackets1_21_4.CONTAINER_CLICK);
+        registerSetCreativeModeSlot(ServerboundPackets1_21_4.SET_CREATIVE_MODE_SLOT);
 
-        final RecipeDisplayRewriter<ClientboundPacket1_21> recipeRewriter = new RecipeDisplayRewriter<>(protocol);
-        recipeRewriter.registerUpdateRecipes(ClientboundPackets1_21.UPDATE_RECIPES);
-        //recipeRewriter.registerRecipeBookAdd(ClientboundPackets1_21.RECIPE_BOOK_ADD);
-        recipeRewriter.registerPlaceGhostRecipe(ClientboundPackets1_21.PLACE_GHOST_RECIPE);
+        final RecipeDisplayRewriter<ClientboundPacket1_21_2> recipeRewriter = new RecipeDisplayRewriter<>(protocol);
+        recipeRewriter.registerUpdateRecipes(ClientboundPackets1_21_2.UPDATE_RECIPES);
+        recipeRewriter.registerRecipeBookAdd(ClientboundPackets1_21_2.RECIPE_BOOK_ADD);
+        recipeRewriter.registerPlaceGhostRecipe(ClientboundPackets1_21_2.PLACE_GHOST_RECIPE);
         // OR do this if serialization of recipes changed and override the relevant method
         // Add new serializers to RecipeDisplayRewriter, or extend the last one for changes
     }

common/src/main/java/com/viaversion/viaversion/protocols/template/ComponentRewriter1_99.java

@@ -19,11 +19,11 @@ package com.viaversion.viaversion.protocols.template;
 
 import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.viaversion.api.connection.UserConnection;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
 import com.viaversion.viaversion.rewriter.ComponentRewriter;
 import com.viaversion.viaversion.util.SerializerVersion;
 
-public final class ComponentRewriter1_99 extends ComponentRewriter<ClientboundPacket1_21> {
+final class ComponentRewriter1_99 extends ComponentRewriter<ClientboundPacket1_21_2> {
 
     public ComponentRewriter1_99(final Protocol1_99To_98 protocol) {
         super(protocol, ReadType.NBT);
@@ -41,6 +41,6 @@ public final class ComponentRewriter1_99 extends ComponentRewriter<ClientboundPa
 
     @Override
     protected SerializerVersion inputSerializerVersion() {
-        return SerializerVersion.V1_20_5;
+        return SerializerVersion.V1_21_4;
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/template/EntityPacketRewriter1_99.java

@@ -17,22 +17,20 @@
  */
 package com.viaversion.viaversion.protocols.template;
 
-import com.viaversion.viaversion.api.minecraft.RegistryEntry;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
-import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_4;
 import com.viaversion.viaversion.api.type.Types;
-import com.viaversion.viaversion.api.type.types.version.Types1_21;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundConfigurationPackets1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.EntityRewriter;
-import com.viaversion.viaversion.util.Key;
+import com.viaversion.viaversion.rewriter.RegistryDataRewriter;
 
 // Replace if needed
 //  Types1_OLD
-//  Types1_21
-final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_21, Protocol1_99To_98> {
+//  Types1_21_4
+final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_21_2, Protocol1_99To_98> {
 
     public EntityPacketRewriter1_99(final Protocol1_99To_98 protocol) {
         super(protocol);
@@ -41,36 +39,32 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
     @Override
     public void registerPackets() {
         // Tracks entities, applies entity data rewrites registered below, untracks entities
-        registerTrackerWithData1_19(ClientboundPackets1_21.ADD_ENTITY, EntityTypes1_20_5.FALLING_BLOCK);
-        registerSetEntityData(ClientboundPackets1_21.SET_ENTITY_DATA, /*Types1_OLD_ENTITY_DATA_LIST, */Types1_21.ENTITY_DATA_LIST); // Specify old and new entity data list if changed
-        registerRemoveEntities(ClientboundPackets1_21.REMOVE_ENTITIES);
+        registerTrackerWithData1_19(ClientboundPackets1_21_2.ADD_ENTITY, EntityTypes1_21_4.FALLING_BLOCK);
+        registerSetEntityData(ClientboundPackets1_21_2.SET_ENTITY_DATA, /*Types1_OLD_ENTITY_DATA_LIST, */Types1_21_4.ENTITY_DATA_LIST); // Specify old and new entity data list if changed
+        registerRemoveEntities(ClientboundPackets1_21_2.REMOVE_ENTITIES);
 
-        protocol.registerClientbound(ClientboundConfigurationPackets1_21.REGISTRY_DATA, wrapper -> {
-            final String registryKey = Key.stripMinecraftNamespace(wrapper.passthrough(Types.STRING));
-            final RegistryEntry[] entries = wrapper.passthrough(Types.REGISTRY_ENTRY_ARRAY);
-            handleRegistryData1_20_5(wrapper.user(), registryKey, entries); // Caches dimensions to access data like height later and tracks the amount of biomes sent for chunk data
+        final RegistryDataRewriter registryDataRewriter = new RegistryDataRewriter(protocol);
+        protocol.registerClientbound(ClientboundConfigurationPackets1_21.REGISTRY_DATA, registryDataRewriter::handle);
+
+        protocol.registerClientbound(ClientboundPackets1_21_2.LOGIN, wrapper -> {
+            final int entityId = wrapper.passthrough(Types.INT); // Entity id
+            wrapper.passthrough(Types.BOOLEAN); // Hardcore
+            wrapper.passthrough(Types.STRING_ARRAY); // World List
+            wrapper.passthrough(Types.VAR_INT); // Max players
+            wrapper.passthrough(Types.VAR_INT); // View distance
+            wrapper.passthrough(Types.VAR_INT); // Simulation distance
+            wrapper.passthrough(Types.BOOLEAN); // Reduced debug info
+            wrapper.passthrough(Types.BOOLEAN); // Show death screen
+            wrapper.passthrough(Types.BOOLEAN); // Limited crafting
+
+            final int dimensionId = wrapper.passthrough(Types.VAR_INT);
+            final String world = wrapper.passthrough(Types.STRING);
+            trackWorldDataByKey1_20_5(wrapper.user(), dimensionId, world);
+
+            trackPlayer(wrapper.user(), entityId);
         });
 
-        protocol.registerClientbound(ClientboundPackets1_21.LOGIN, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Types.INT); // Entity id
-                map(Types.BOOLEAN); // Hardcore
-                map(Types.STRING_ARRAY); // World List
-                map(Types.VAR_INT); // Max players
-                map(Types.VAR_INT); // View distance
-                map(Types.VAR_INT); // Simulation distance
-                map(Types.BOOLEAN); // Reduced debug info
-                map(Types.BOOLEAN); // Show death screen
-                map(Types.BOOLEAN); // Limited crafting
-                map(Types.VAR_INT); // Dimension id
-                map(Types.STRING); // World
-                handler(worldDataTrackerHandlerByKey1_20_5(3)); // Tracks world height and name for chunk data and entity (un)tracking
-                handler(playerTrackerHandler());
-            }
-        });
-
-        protocol.registerClientbound(ClientboundPackets1_21.RESPAWN, wrapper -> {
+        protocol.registerClientbound(ClientboundPackets1_21_2.RESPAWN, wrapper -> {
             final int dimensionId = wrapper.passthrough(Types.VAR_INT);
             final String world = wrapper.passthrough(Types.STRING);
             trackWorldDataByKey1_20_5(wrapper.user(), dimensionId, world); // Tracks world height and name for chunk data and entity (un)tracking
@@ -85,20 +79,20 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
             if (id >= SomeAddedIndex) {
                 id++;
             }
-            return Types1_21.ENTITY_DATA_TYPES.byId(id);
+            return Types1_21_4.ENTITY_DATA_TYPES.byId(id);
         });*/
 
         // Registers registry type id changes
         registerEntityDataTypeHandler(
-            Types1_21.ENTITY_DATA_TYPES.itemType,
-            Types1_21.ENTITY_DATA_TYPES.blockStateType,
-            Types1_21.ENTITY_DATA_TYPES.optionalBlockStateType,
-            Types1_21.ENTITY_DATA_TYPES.particleType,
-            Types1_21.ENTITY_DATA_TYPES.particlesType,
-            Types1_21.ENTITY_DATA_TYPES.componentType,
-            Types1_21.ENTITY_DATA_TYPES.optionalComponentType
+            Types1_21_4.ENTITY_DATA_TYPES.itemType,
+            Types1_21_4.ENTITY_DATA_TYPES.blockStateType,
+            Types1_21_4.ENTITY_DATA_TYPES.optionalBlockStateType,
+            Types1_21_4.ENTITY_DATA_TYPES.particleType,
+            Types1_21_4.ENTITY_DATA_TYPES.particlesType,
+            Types1_21_4.ENTITY_DATA_TYPES.componentType,
+            Types1_21_4.ENTITY_DATA_TYPES.optionalComponentType
         );
-        registerBlockStateHandler(EntityTypes1_20_5.ABSTRACT_MINECART, 11);
+        registerBlockStateHandler(EntityTypes1_21_4.ABSTRACT_MINECART, 11);
     }
 
     @Override
@@ -109,6 +103,6 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
 
     @Override
     public EntityType typeFromId(final int type) {
-        return EntityTypes1_20_5.getTypeFromId(type);
+        return EntityTypes1_21_4.getTypeFromId(type);
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/template/Protocol1_99To_98.java

@@ -20,19 +20,21 @@ package com.viaversion.viaversion.protocols.template;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.data.MappingData;
 import com.viaversion.viaversion.api.data.MappingDataBase;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_4;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.packet.provider.PacketTypesProvider;
 import com.viaversion.viaversion.api.protocol.packet.provider.SimplePacketTypesProvider;
-import com.viaversion.viaversion.api.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
 import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundConfigurationPackets1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPacket1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPackets1_20_5;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundConfigurationPackets1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPacket1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPackets1_21_4;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.AttributeRewriter;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -41,50 +43,56 @@ import static com.viaversion.viaversion.util.ProtocolUtil.packetTypeMap;
 
 // Placeholders to replace (in the entire package):
 //   Protocol1_99To_98, EntityPacketRewriter1_99, BlockItemPacketRewriter1_99 - move the latter two to a rewriter package
-//   ClientboundPacket1_21
-//   ServerboundPacket1_20_5
-//   EntityTypes1_20_5 (MAPPED type)
+//   ClientboundPacket1_21_2
+//   ServerboundPacket1_21_4
+//   EntityTypes1_21_4 (MAPPED type)
+//   Types1_21_4.PARTICLE
 //   1.99, 1.98
-final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, ClientboundPacket1_21, ServerboundPacket1_20_5, ServerboundPacket1_20_5> {
+final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21_2, ClientboundPacket1_21_2, ServerboundPacket1_21_4, ServerboundPacket1_21_4> {
 
     public static final MappingData MAPPINGS = new MappingDataBase("1.98", "1.99");
     private final EntityPacketRewriter1_99 entityRewriter = new EntityPacketRewriter1_99(this);
     private final BlockItemPacketRewriter1_99 itemRewriter = new BlockItemPacketRewriter1_99(this);
-    private final TagRewriter<ClientboundPacket1_21> tagRewriter = new TagRewriter<>(this);
-    private final ComponentRewriter1_99 componentRewriter = new ComponentRewriter1_99(this);
+    private final ParticleRewriter<ClientboundPacket1_21_2> particleRewriter = new ParticleRewriter<>(this, /*Types1_OLD.PARTICLE,*/ Types1_21_4.PARTICLE);
+    private final TagRewriter<ClientboundPacket1_21_2> tagRewriter = new TagRewriter<>(this);
+    private final ComponentRewriter<ClientboundPacket1_21_2> componentRewriter = new ComponentRewriter1_99(this);
 
     public Protocol1_99To_98() {
         // Passing the class types into the super constructor is needed for automatic packet type id remapping, but can otherwise be omitted
-        super(ClientboundPacket1_21.class, ClientboundPacket1_21.class, ServerboundPacket1_20_5.class, ServerboundPacket1_20_5.class);
+        super(ClientboundPacket1_21_2.class, ClientboundPacket1_21_2.class, ServerboundPacket1_21_4.class, ServerboundPacket1_21_4.class);
     }
 
     @Override
     protected void registerPackets() {
         super.registerPackets();
 
-        tagRewriter.registerGeneric(ClientboundPackets1_21.UPDATE_TAGS);
+        tagRewriter.registerGeneric(ClientboundPackets1_21_2.UPDATE_TAGS);
         tagRewriter.registerGeneric(ClientboundConfigurationPackets1_21.UPDATE_TAGS);
 
         // If needed for item or component changes
-        componentRewriter.registerOpenScreen(ClientboundPackets1_21.OPEN_SCREEN);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.SET_ACTION_BAR_TEXT);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.SET_TITLE_TEXT);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.SET_SUBTITLE_TEXT);
-        componentRewriter.registerBossEvent(ClientboundPackets1_21.BOSS_EVENT);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.DISCONNECT);
-        componentRewriter.registerTabList(ClientboundPackets1_21.TAB_LIST);
-        componentRewriter.registerPlayerCombatKill1_20(ClientboundPackets1_21.PLAYER_COMBAT_KILL);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.SYSTEM_CHAT);
-        componentRewriter.registerComponentPacket(ClientboundPackets1_21.DISGUISED_CHAT);
-        componentRewriter.registerPlayerInfoUpdate1_21_2(ClientboundPackets1_21.PLAYER_INFO_UPDATE);
+        componentRewriter.registerOpenScreen(ClientboundPackets1_21_2.OPEN_SCREEN);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_ACTION_BAR_TEXT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_TITLE_TEXT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_SUBTITLE_TEXT);
+        componentRewriter.registerBossEvent(ClientboundPackets1_21_2.BOSS_EVENT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.DISCONNECT);
+        componentRewriter.registerTabList(ClientboundPackets1_21_2.TAB_LIST);
+        componentRewriter.registerPlayerCombatKill1_20(ClientboundPackets1_21_2.PLAYER_COMBAT_KILL);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SYSTEM_CHAT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.DISGUISED_CHAT);
+        componentRewriter.registerPlayerInfoUpdate1_21_4(ClientboundPackets1_21_2.PLAYER_INFO_UPDATE);
         componentRewriter.registerPing();
 
-        final SoundRewriter<ClientboundPacket1_21> soundRewriter = new SoundRewriter<>(this);
-        soundRewriter.registerSound1_19_3(ClientboundPackets1_21.SOUND);
-        soundRewriter.registerSound1_19_3(ClientboundPackets1_21.SOUND_ENTITY);
+        // If needed for any particle, item, or block changes. Extend ParticleRewriter for particle serializer changes
+        particleRewriter.registerLevelParticles1_20_5(ClientboundPackets1_21_2.LEVEL_PARTICLES);
+        particleRewriter.registerExplode1_21_2(ClientboundPackets1_21_2.EXPLODE); // Rewrites the included sound and particles
 
-        new StatisticsRewriter<>(this).register(ClientboundPackets1_21.AWARD_STATS);
-        new AttributeRewriter<>(this).register1_21(ClientboundPackets1_21.UPDATE_ATTRIBUTES);
+        final SoundRewriter<ClientboundPacket1_21_2> soundRewriter = new SoundRewriter<>(this);
+        soundRewriter.registerSound1_19_3(ClientboundPackets1_21_2.SOUND);
+        soundRewriter.registerSound1_19_3(ClientboundPackets1_21_2.SOUND_ENTITY);
+
+        new StatisticsRewriter<>(this).register(ClientboundPackets1_21_2.AWARD_STATS);
+        new AttributeRewriter<>(this).register1_21(ClientboundPackets1_21_2.UPDATE_ATTRIBUTES);
 
         // Uncomment if an existing type changed serialization format. Mappings for argument type keys can also be defined in mapping files
         /*new CommandRewriter1_19_4<>(this) {
@@ -97,27 +105,28 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
                     super.handleArgument(wrapper, argumentType);
                 }
             }
-        }.registerDeclareCommands1_19(ClientboundPackets1_21.COMMANDS);*/
+        }.registerDeclareCommands1_19(ClientboundPackets1_21_2.COMMANDS);*/
     }
 
     @Override
     protected void onMappingDataLoaded() {
         // Uncomment this if the entity types enum has been newly added specifically for this Protocol
-        // EntityTypes1_20_5.initialize(this);
+        // EntityTypes1_21_4.initialize(this);
 
         // Uncomment if a new particle was added = ids shifted; requires a new Types_ class copied from the last
-        /*Types1_21_2.PARTICLE.filler(this)
+        /*Types1_21_4.PARTICLE.filler(this)
             .reader("block", ParticleType.Readers.BLOCK)
             .reader("block_marker", ParticleType.Readers.BLOCK)
-            .reader("dust", ParticleType.Readers.DUST1_21_2)
             .reader("dust_pillar", ParticleType.Readers.BLOCK)
             .reader("falling_dust", ParticleType.Readers.BLOCK)
+            .reader("block_crumble", ParticleType.Readers.BLOCK)
+            .reader("dust", ParticleType.Readers.DUST1_21_2)
             .reader("dust_color_transition", ParticleType.Readers.DUST_TRANSITION1_21_2)
             .reader("vibration", ParticleType.Readers.VIBRATION1_20_3)
             .reader("sculk_charge", ParticleType.Readers.SCULK_CHARGE)
             .reader("shriek", ParticleType.Readers.SHRIEK)
             .reader("entity_effect", ParticleType.Readers.COLOR)
-            .reader("trail", ParticleType.Readers.TRAIL)
+            .reader("trail", ParticleType.Readers.TRAIL1_21_4)
             .reader("item", ParticleType.Readers.item(itemRewriter.mappedItemType()));*/
 
         super.onMappingDataLoaded(); // Calls load methods on rewriters. Last in case the rewriters access the above filled data
@@ -126,7 +135,7 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
     @Override
     public void init(final UserConnection connection) {
         // Register the entity tracker - used for entity id/entity data rewriting AND for tracking world data sent to the client (then used for chunk data rewriting)
-        addEntityTracker(connection, new EntityTrackerBase(connection, EntityTypes1_20_5.PLAYER));
+        addEntityTracker(connection, new EntityTrackerBase(connection, EntityTypes1_21_4.PLAYER));
     }
 
     // Overriding these four methods is important as they are relied on various rewriter classes
@@ -147,22 +156,27 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
     }
 
     @Override
-    public TagRewriter<ClientboundPacket1_21> getTagRewriter() {
+    public ParticleRewriter<ClientboundPacket1_21_2> getParticleRewriter() {
+        return particleRewriter;
+    }
+
+    @Override
+    public TagRewriter<ClientboundPacket1_21_2> getTagRewriter() {
         return tagRewriter;
     }
 
     @Override
-    public ComponentRewriter getComponentRewriter() {
+    public ComponentRewriter<ClientboundPacket1_21_2> getComponentRewriter() {
         return componentRewriter;
     }
 
     @Override
-    protected PacketTypesProvider<ClientboundPacket1_21, ClientboundPacket1_21, ServerboundPacket1_20_5, ServerboundPacket1_20_5> createPacketTypesProvider() {
+    protected PacketTypesProvider<ClientboundPacket1_21_2, ClientboundPacket1_21_2, ServerboundPacket1_21_4, ServerboundPacket1_21_4> createPacketTypesProvider() {
         return new SimplePacketTypesProvider<>(
-            packetTypeMap(unmappedClientboundPacketType, ClientboundPackets1_21.class, ClientboundConfigurationPackets1_21.class),
-            packetTypeMap(mappedClientboundPacketType, ClientboundPackets1_21.class, ClientboundConfigurationPackets1_21.class),
-            packetTypeMap(mappedServerboundPacketType, ServerboundPackets1_20_5.class, ServerboundConfigurationPackets1_20_5.class),
-            packetTypeMap(unmappedServerboundPacketType, ServerboundPackets1_20_5.class, ServerboundConfigurationPackets1_20_5.class)
+            packetTypeMap(unmappedClientboundPacketType, ClientboundPackets1_21_2.class, ClientboundConfigurationPackets1_21.class),
+            packetTypeMap(mappedClientboundPacketType, ClientboundPackets1_21_2.class, ClientboundConfigurationPackets1_21.class),
+            packetTypeMap(mappedServerboundPacketType, ServerboundPackets1_21_4.class, ServerboundConfigurationPackets1_20_5.class),
+            packetTypeMap(unmappedServerboundPacketType, ServerboundPackets1_21_4.class, ServerboundConfigurationPackets1_20_5.class)
         );
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/Protocol1_10To1_11.java

@@ -132,13 +132,13 @@ public class Protocol1_10To1_11 extends AbstractProtocol<ClientboundPackets1_9_3
                     if (effectID == 2002) {
                         int data = packetWrapper.get(Types.INT, 1);
                         boolean isInstant = false;
-                        Pair<Integer, Boolean> newData = PotionColorMappings1_11.getNewData(data);
+                        PotionColorMappings1_11.PotionData newData = PotionColorMappings1_11.getNewData(data);
                         if (newData == null) {
                             getLogger().warning("Received unknown potion data: " + data);
                             data = 0;
                         } else {
-                            data = newData.key();
-                            isInstant = newData.value();
+                            data = newData.data();
+                            isInstant = newData.instant();
                         }
                         if (isInstant) {
                             packetWrapper.set(Types.INT, 0, 2007);

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/data/PotionColorMappings1_11.java

@@ -17,14 +17,13 @@
  */
 package com.viaversion.viaversion.protocols.v1_10to1_11.data;
 
-import com.viaversion.viaversion.util.Pair;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class PotionColorMappings1_11 {
 
-    //<oldData> to <newData, isInstant> mapping
-    private static final Int2ObjectMap<Pair<Integer, Boolean>> POTIONS = new Int2ObjectOpenHashMap<>(37);
+    private static final Int2ObjectMap<PotionData> POTIONS = new Int2ObjectOpenHashMap<>(37);
 
     static {
         addRewrite(0, 3694022, false);
@@ -66,12 +65,14 @@ public class PotionColorMappings1_11 {
         addRewrite(36, 3381504, false);
     }
 
-    public static Pair<Integer, Boolean> getNewData(int oldData) {
+    public static @Nullable PotionData getNewData(int oldData) {
         return POTIONS.get(oldData);
     }
 
     private static void addRewrite(int oldData, int newData, boolean isInstant) {
-        POTIONS.put(oldData, new Pair<>(newData, isInstant));
+        POTIONS.put(oldData, new PotionData(newData, isInstant));
     }
 
+    public record PotionData(int data, boolean instant) {
+    }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/rewriter/EntityPacketRewriter1_11.java

@@ -24,9 +24,9 @@ import com.viaversion.viaversion.api.minecraft.ClientWorld;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_10;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11.EntityType;
-import com.viaversion.viaversion.api.minecraft.item.DataItem;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
 import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_9;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Types;
@@ -37,6 +37,7 @@ import com.viaversion.viaversion.protocols.v1_10to1_11.data.EntityMappings1_11;
 import com.viaversion.viaversion.protocols.v1_10to1_11.storage.EntityTracker1_11;
 import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
 import com.viaversion.viaversion.rewriter.EntityRewriter;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.logging.Level;
@@ -91,13 +92,27 @@ public class EntityPacketRewriter1_11 extends EntityRewriter<ClientboundPackets1
                 map(Types.INT); // 8 - Data
 
                 // Track Entity
+                handler(objectTrackerHandler());
                 handler(wrapper -> {
                     byte type = wrapper.get(Types.BYTE, 0);
                     if (type == EntityTypes1_10.ObjectType.FISHIHNG_HOOK.getId()) {
                         tryFixFishingHookVelocity(wrapper);
+                    } else if (type == EntityTypes1_10.ObjectType.ITEM.getId()) {
+                        // Older clients used stone as fallback as long as the entity data was not set
+                        wrapper.send(Protocol1_10To1_11.class);
+                        wrapper.cancel();
+
+                        final int entityId = wrapper.get(Types.VAR_INT, 0);
+
+                        final List<EntityData> entityDataList = new ArrayList<>();
+                        entityDataList.add(new EntityData(6, EntityDataTypes1_9.ITEM, new DataItem(1, (byte) 1, null)));
+
+                        final PacketWrapper setItem = PacketWrapper.create(ClientboundPackets1_9_3.SET_ENTITY_DATA, wrapper.user());
+                        setItem.write(Types.VAR_INT, entityId);
+                        setItem.write(Types1_9.ENTITY_DATA_LIST, entityDataList);
+                        setItem.send(Protocol1_10To1_11.class);
                     }
                 });
-                handler(objectTrackerHandler());
             }
         });
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/Protocol1_12_2To1_13.java

@@ -166,8 +166,8 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     wrapper.write(Types.VAR_INT_ARRAY_PRIMITIVE, tag.getValue().clone());
                 }
             });
-            if (w.user().getProtocolInfo().protocolVersion().newerThanOrEqualTo(ProtocolVersion.v1_20_2)) {
-                // Make sure it's included in the configuration packets
+            if (w.user().getProtocolInfo().protocolVersion().newerThanOrEqualTo(ProtocolVersion.v1_20_5)) {
+                // Make sure it's included in the configuration packets as it may already be required for registry data
                 tagsPacket.send(Protocol1_12_2To1_13.class);
             } else {
                 tagsPacket.scheduleSend(Protocol1_12_2To1_13.class);
@@ -775,7 +775,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     for (Item[] ingredient : recipe.ingredients()) {
                         Item[] clone = new Item[ingredient.length];
                         for (int i = 0; i < ingredient.length; i++) {
-                            if (clone[i] == null) continue;
+                            if (ingredient[i] == null) {
+                                continue;
+                            }
+
                             clone[i] = ingredient[i].copy();
                         }
                         recipesPacket.write(Types.ITEM1_13_ARRAY, clone);
@@ -789,7 +792,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     for (Item[] ingredient : recipe.ingredients()) {
                         Item[] clone = new Item[ingredient.length];
                         for (int i = 0; i < ingredient.length; i++) {
-                            if (clone[i] == null) continue;
+                            if (ingredient[i] == null) {
+                                continue;
+                            }
+
                             clone[i] = ingredient[i].copy();
                         }
                         recipesPacket.write(Types.ITEM1_13_ARRAY, clone);
@@ -800,7 +806,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     recipesPacket.write(Types.STRING, recipe.group());
                     Item[] ingredient = new Item[recipe.ingredient().length];
                     for (int i = 0; i < ingredient.length; i++) {
-                        if (recipe.ingredient()[i] == null) continue;
+                        if (recipe.ingredient()[i] == null) {
+                            continue;
+                        }
+
                         ingredient[i] = recipe.ingredient()[i].copy();
                     }
                     recipesPacket.write(Types.ITEM1_13_ARRAY, ingredient);

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/provider/BlockEntityProvider.java

@@ -33,6 +33,7 @@ import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.FlowerPotHandler;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.SkullHandler;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.SpawnerHandler;
+import com.viaversion.viaversion.util.ComponentUtil;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -46,6 +47,21 @@ public class BlockEntityProvider implements Provider {
         handlers.put("minecraft:skull", new SkullHandler());
         handlers.put("minecraft:mob_spawner", new SpawnerHandler());
         handlers.put("minecraft:command_block", new CommandBlockHandler());
+
+        final BlockEntityHandler customNameHandler = (user, tag) -> {
+            final StringTag name = tag.getStringTag("CustomName");
+            if (name != null) {
+                name.setValue(ComponentUtil.legacyToJsonString(name.getValue()));
+            }
+            return -1;
+        };
+        handlers.put("minecraft:chest", customNameHandler);
+        handlers.put("minecraft:dispenser", customNameHandler);
+        handlers.put("minecraft:dropper", customNameHandler);
+        handlers.put("minecraft:enchanting_table", customNameHandler);
+        handlers.put("minecraft:furnace", customNameHandler);
+        handlers.put("minecraft:hopper", customNameHandler);
+        handlers.put("minecraft:shulker_box", customNameHandler);
     }
 
     /**

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/provider/blockentities/FlowerPotHandler.java

@@ -18,16 +18,19 @@
 package com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities;
 
 import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.BlockEntityProvider;
 import com.viaversion.viaversion.util.Key;
-import com.viaversion.viaversion.util.Pair;
+import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 public class FlowerPotHandler implements BlockEntityProvider.BlockEntityHandler {
-    // Object -> string (id without namespace) or byte (numeric id)
-    private static final Map<Pair<?, Byte>, Integer> flowers = new ConcurrentHashMap<>();
+    private static final int EMPTY_POT = 5265;
+    private static final Map<String, Byte> STRING_TO_BYTE_ID = new HashMap<>();
+    private static final Map<IntIdPair, Integer> FLOWERS = new HashMap<>();
 
     static {
         register("air", (byte) 0, (byte) 0, 5265);
@@ -55,37 +58,40 @@ public class FlowerPotHandler implements BlockEntityProvider.BlockEntityHandler
 
     }
 
-    public static void register(String identifier, byte numbericBlockId, byte blockData, int newId) {
-        flowers.put(new Pair<>(identifier, blockData), newId);
-        flowers.put(new Pair<>(numbericBlockId, blockData), newId);
+    private static void register(String identifier, byte blockId, byte blockData, int newId) {
+        STRING_TO_BYTE_ID.put(identifier, blockId);
+        FLOWERS.put(new IntIdPair(blockId, blockData), newId);
     }
 
     @Override
     public int transform(UserConnection user, CompoundTag tag) {
-        Object item = tag.contains("Item") ? tag.get("Item").getValue() : null;
-        Object data = tag.contains("Data") ? tag.get("Data").getValue() : null;
-
         // Convert item to String without namespace or to Byte
-        if (item instanceof String) {
-            item = Key.stripMinecraftNamespace((String) item);
-        } else if (item instanceof Number) {
-            item = ((Number) item).byteValue();
-        } else {
-            item = (byte) 0;
+        Tag itemTag = tag.get("Item");
+        byte item = 0;
+        if (itemTag instanceof StringTag stringTag) {
+            item = STRING_TO_BYTE_ID.getOrDefault(Key.stripMinecraftNamespace(stringTag.getValue()), (byte) 0);
+        } else if (itemTag instanceof NumberTag numberTag) {
+            item = numberTag.asByte();
         }
 
-        // Convert data to Byte
-        if (data instanceof Number) {
-            data = ((Number) data).byteValue();
-        } else {
-            data = (byte) 0;
+        byte data = 0;
+        if (tag.get("Data") instanceof NumberTag dataTag) {
+            data = dataTag.asByte();
         }
 
-        Integer flower = flowers.get(new Pair<>(item, (byte) data));
-        if (flower != null) return flower;
-        flower = flowers.get(new Pair<>(item, (byte) 0));
-        if (flower != null) return flower;
+        Integer flower = FLOWERS.get(new IntIdPair(item, data));
+        if (flower != null) {
+            return flower;
+        }
 
-        return 5265; // Fallback to empty pot
+        flower = FLOWERS.get(new IntIdPair(item, (byte) 0));
+        if (flower != null) {
+            return flower;
+        }
+
+        return EMPTY_POT; // Fallback to empty pot
+    }
+
+    private record IntIdPair(int id, byte data) {
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/rewriter/ItemPacketRewriter1_13.java

@@ -205,23 +205,23 @@ public class ItemPacketRewriter1_13 extends ItemRewriter<ClientboundPackets1_12_
                     String old = channel;
                     channel = getOldPluginChannelId(channel);
                     if (channel == null) {
-                        if (!Via.getConfig().isSuppressConversionWarnings()) {
+                        if (Via.getManager().isDebug()) {
                             protocol.getLogger().warning("Ignoring serverbound plugin message with channel: " + old);
                         }
                         wrapper.cancel();
                         return;
                     } else if (channel.equals("REGISTER") || channel.equals("UNREGISTER")) {
-                        String[] channels = new String(wrapper.read(Types.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                        String[] channels = new String(wrapper.read(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA), StandardCharsets.UTF_8).split("\0");
                         List<String> rewrittenChannels = new ArrayList<>();
                         for (String s : channels) {
                             String rewritten = getOldPluginChannelId(s);
                             if (rewritten != null) {
                                 rewrittenChannels.add(rewritten);
-                            } else if (!Via.getConfig().isSuppressConversionWarnings()) {
+                            } else if (Via.getManager().isDebug()) {
                                 protocol.getLogger().warning("Ignoring plugin channel in serverbound " + channel + ": " + s);
                             }
                         }
-                        wrapper.write(Types.REMAINING_BYTES, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
+                        wrapper.write(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
                     }
                     wrapper.set(Types.STRING, 0, channel);
                 });

common/src/main/java/com/viaversion/viaversion/protocols/v1_13_1to1_13_2/rewriter/EntityPacketRewriter1_13_2.java

@@ -17,7 +17,10 @@
  */
 package com.viaversion.viaversion.protocols.v1_13_1to1_13_2.rewriter;
 
+import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Types;
@@ -30,8 +33,16 @@ public class EntityPacketRewriter1_13_2 {
 
     public static void register(Protocol1_13_1To1_13_2 protocol) {
         final PacketHandler dataTypeHandler = wrapper -> {
-            for (EntityData data : wrapper.get(Types1_13_2.ENTITY_DATA_LIST, 0)) {
-                data.setDataType(Types1_13_2.ENTITY_DATA_TYPES.byId(data.dataType().typeId()));
+            for (final EntityData data : wrapper.get(Types1_13_2.ENTITY_DATA_LIST, 0)) {
+                final EntityDataType dataType = Types1_13_2.ENTITY_DATA_TYPES.byId(data.dataType().typeId());
+                if (dataType == Types1_13_2.ENTITY_DATA_TYPES.particleType) {
+                    final Particle particle = data.value();
+                    if (particle.id() == 27) {
+                        final Item item = particle.<Item>getArgument(0).getValue();
+                        particle.set(0, Types.ITEM1_13_2, item);
+                    }
+                }
+                data.setDataType(dataType);
             }
         };
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_13_2to1_14/Protocol1_13_2To1_14.java

@@ -23,15 +23,16 @@ import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_14;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
 import com.viaversion.viaversion.api.type.types.version.Types1_13_2;
 import com.viaversion.viaversion.api.type.types.version.Types1_14;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
-import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.ComponentRewriter1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.data.MappingData1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.packet.ClientboundPackets1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.packet.ServerboundPackets1_14;
+import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.ComponentRewriter1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.EntityPacketRewriter1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.ItemPacketRewriter1_14;
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.PlayerPacketRewriter1_14;
@@ -39,6 +40,7 @@ import com.viaversion.viaversion.protocols.v1_13_2to1_14.rewriter.WorldPacketRew
 import com.viaversion.viaversion.protocols.v1_13_2to1_14.storage.EntityTracker1_14;
 import com.viaversion.viaversion.rewriter.CommandRewriter;
 import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -49,6 +51,7 @@ public class Protocol1_13_2To1_14 extends AbstractProtocol<ClientboundPackets1_1
     public static final MappingData1_14 MAPPINGS = new MappingData1_14();
     private final EntityPacketRewriter1_14 entityRewriter = new EntityPacketRewriter1_14(this);
     private final ItemPacketRewriter1_14 itemRewriter = new ItemPacketRewriter1_14(this);
+    private final ParticleRewriter<ClientboundPackets1_13> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_13> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_13_2To1_14() {
@@ -65,6 +68,8 @@ public class Protocol1_13_2To1_14 extends AbstractProtocol<ClientboundPackets1_1
         new SoundRewriter<>(this).registerSound(ClientboundPackets1_13.SOUND);
         new StatisticsRewriter<>(this).register(ClientboundPackets1_13.AWARD_STATS);
 
+        particleRewriter.registerLevelParticles1_13(ClientboundPackets1_13.LEVEL_PARTICLES, Types.FLOAT);
+
         ComponentRewriter<ClientboundPackets1_13> componentRewriter = new ComponentRewriter1_14<>(this);
         componentRewriter.registerComponentPacket(ClientboundPackets1_13.CHAT);
 
@@ -139,6 +144,11 @@ public class Protocol1_13_2To1_14 extends AbstractProtocol<ClientboundPackets1_1
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_13> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_13> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_13_2to1_14/rewriter/ItemPacketRewriter1_14.java

@@ -206,8 +206,6 @@ public class ItemPacketRewriter1_14 extends ItemRewriter<ClientboundPackets1_13,
         });
 
         registerSetCreativeModeSlot(ServerboundPackets1_14.SET_CREATIVE_MODE_SLOT);
-
-        registerLevelParticles(ClientboundPackets1_13.LEVEL_PARTICLES, Types.FLOAT);
     }
 
     @Override

common/src/main/java/com/viaversion/viaversion/protocols/v1_13to1_13_1/Protocol1_13To1_13_1.java

@@ -35,6 +35,7 @@ import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPacke
 import com.viaversion.viaversion.protocols.v1_13to1_13_1.rewriter.EntityPacketRewriter1_13_1;
 import com.viaversion.viaversion.protocols.v1_13to1_13_1.rewriter.ItemPacketRewriter1_13_1;
 import com.viaversion.viaversion.protocols.v1_13to1_13_1.rewriter.WorldPacketRewriter1_13_1;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
 
@@ -43,6 +44,7 @@ public class Protocol1_13To1_13_1 extends AbstractProtocol<ClientboundPackets1_1
     public static final MappingData MAPPINGS = new MappingDataBase("1.13", "1.13.2");
     private final EntityPacketRewriter1_13_1 entityRewriter = new EntityPacketRewriter1_13_1(this);
     private final ItemPacketRewriter1_13_1 itemRewriter = new ItemPacketRewriter1_13_1(this);
+    private final ParticleRewriter<ClientboundPackets1_13> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_13> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_13To1_13_1() {
@@ -128,6 +130,8 @@ public class Protocol1_13To1_13_1 extends AbstractProtocol<ClientboundPackets1_1
         });
 
         tagRewriter.register(ClientboundPackets1_13.UPDATE_TAGS, RegistryType.ITEM);
+        particleRewriter.registerLevelParticles1_13(ClientboundPackets1_13.LEVEL_PARTICLES, Types.FLOAT);
+
         new StatisticsRewriter<>(this).register(ClientboundPackets1_13.AWARD_STATS);
     }
 
@@ -152,6 +156,11 @@ public class Protocol1_13To1_13_1 extends AbstractProtocol<ClientboundPackets1_1
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_13> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_13> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_13to1_13_1/rewriter/ItemPacketRewriter1_13_1.java

@@ -97,7 +97,5 @@ public class ItemPacketRewriter1_13_1 extends ItemRewriter<ClientboundPackets1_1
 
         registerContainerClick(ServerboundPackets1_13.CONTAINER_CLICK);
         registerSetCreativeModeSlot(ServerboundPackets1_13.SET_CREATIVE_MODE_SLOT);
-
-        registerLevelParticles(ClientboundPackets1_13.LEVEL_PARTICLES, Types.FLOAT);
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_14_4to1_15/Protocol1_14_4To1_15.java

@@ -31,6 +31,7 @@ import com.viaversion.viaversion.protocols.v1_14_4to1_15.packet.ClientboundPacke
 import com.viaversion.viaversion.protocols.v1_14_4to1_15.rewriter.EntityPacketRewriter1_15;
 import com.viaversion.viaversion.protocols.v1_14_4to1_15.rewriter.ItemPacketRewriter1_15;
 import com.viaversion.viaversion.protocols.v1_14_4to1_15.rewriter.WorldPacketRewriter1_15;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -40,6 +41,7 @@ public class Protocol1_14_4To1_15 extends AbstractProtocol<ClientboundPackets1_1
     public static final MappingData MAPPINGS = new MappingDataBase("1.14", "1.15");
     private final EntityPacketRewriter1_15 entityRewriter = new EntityPacketRewriter1_15(this);
     private final ItemPacketRewriter1_15 itemRewriter = new ItemPacketRewriter1_15(this);
+    private final ParticleRewriter<ClientboundPackets1_14_4> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_14_4> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_14_4To1_15() {
@@ -95,8 +97,13 @@ public class Protocol1_14_4To1_15 extends AbstractProtocol<ClientboundPackets1_1
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_14_4> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_14_4> getTagRewriter() {
         return tagRewriter;
     }
-}
+}

common/src/main/java/com/viaversion/viaversion/protocols/v1_15_2to1_16/Protocol1_15_2To1_16.java

@@ -47,6 +47,7 @@ import com.viaversion.viaversion.protocols.v1_15_2to1_16.rewriter.EntityPacketRe
 import com.viaversion.viaversion.protocols.v1_15_2to1_16.rewriter.ItemPacketRewriter1_16;
 import com.viaversion.viaversion.protocols.v1_15_2to1_16.rewriter.WorldPacketRewriter1_16;
 import com.viaversion.viaversion.protocols.v1_15_2to1_16.storage.InventoryTracker1_16;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -63,6 +64,7 @@ public class Protocol1_15_2To1_16 extends AbstractProtocol<ClientboundPackets1_1
     public static final MappingData MAPPINGS = new MappingDataBase("1.15", "1.16");
     private final EntityPacketRewriter1_16 entityRewriter = new EntityPacketRewriter1_16(this);
     private final ItemPacketRewriter1_16 itemRewriter = new ItemPacketRewriter1_16(this);
+    private final ParticleRewriter<ClientboundPackets1_15> particleRewriter = new ParticleRewriter<>(this);
     private final ComponentRewriter1_16 componentRewriter = new ComponentRewriter1_16(this);
     private final TagRewriter<ClientboundPackets1_15> tagRewriter = new TagRewriter<>(this);
 
@@ -77,6 +79,7 @@ public class Protocol1_15_2To1_16 extends AbstractProtocol<ClientboundPackets1_1
         WorldPacketRewriter1_16.register(this);
 
         tagRewriter.register(ClientboundPackets1_15.UPDATE_TAGS, RegistryType.ENTITY);
+        particleRewriter.registerLevelParticles1_13(ClientboundPackets1_15.LEVEL_PARTICLES, Types.DOUBLE);
 
         new StatisticsRewriter<>(this).register(ClientboundPackets1_15.AWARD_STATS);
 
@@ -169,16 +172,16 @@ public class Protocol1_15_2To1_16 extends AbstractProtocol<ClientboundPackets1_1
                         final String channel = wrapper.get(Types.STRING, 0);
                         final String namespacedChannel = Key.namespaced(channel);
                         if (channel.length() > 32) {
-                            if (!Via.getConfig().isSuppressConversionWarnings()) {
+                            if (Via.getManager().isDebug()) {
                                 getLogger().warning("Ignoring serverbound plugin channel, as it is longer than 32 characters: " + channel);
                             }
                             wrapper.cancel();
                         } else if (namespacedChannel.equals("minecraft:register") || namespacedChannel.equals("minecraft:unregister")) {
-                            String[] channels = new String(wrapper.read(Types.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                            String[] channels = new String(wrapper.read(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA), StandardCharsets.UTF_8).split("\0");
                             List<String> checkedChannels = new ArrayList<>(channels.length);
                             for (String registeredChannel : channels) {
                                 if (registeredChannel.length() > 32) {
-                                    if (!Via.getConfig().isSuppressConversionWarnings()) {
+                                    if (Via.getManager().isDebug()) {
                                         getLogger().warning("Ignoring serverbound plugin channel register of '" + registeredChannel + "', as it is longer than 32 characters");
                                     }
                                     continue;
@@ -192,7 +195,7 @@ public class Protocol1_15_2To1_16 extends AbstractProtocol<ClientboundPackets1_1
                                 return;
                             }
 
-                            wrapper.write(Types.REMAINING_BYTES, Joiner.on('\0').join(checkedChannels).getBytes(StandardCharsets.UTF_8));
+                            wrapper.write(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA, Joiner.on('\0').join(checkedChannels).getBytes(StandardCharsets.UTF_8));
                         }
                     });
                 }
@@ -255,6 +258,11 @@ public class Protocol1_15_2To1_16 extends AbstractProtocol<ClientboundPackets1_1
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_15> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     public ComponentRewriter1_16 getComponentRewriter() {
         return componentRewriter;
     }

common/src/main/java/com/viaversion/viaversion/protocols/v1_15_2to1_16/rewriter/ItemPacketRewriter1_16.java

@@ -136,8 +136,6 @@ public class ItemPacketRewriter1_16 extends ItemRewriter<ClientboundPackets1_15,
         });
 
         protocol.registerServerbound(ServerboundPackets1_16.EDIT_BOOK, wrapper -> handleItemToServer(wrapper.user(), wrapper.passthrough(Types.ITEM1_13_2)));
-
-        registerLevelParticles(ClientboundPackets1_15.LEVEL_PARTICLES, Types.DOUBLE);
     }
 
     @Override

common/src/main/java/com/viaversion/viaversion/protocols/v1_16_1to1_16_2/Protocol1_16_1To1_16_2.java

@@ -31,6 +31,7 @@ import com.viaversion.viaversion.protocols.v1_16_1to1_16_2.packet.ServerboundPac
 import com.viaversion.viaversion.protocols.v1_16_1to1_16_2.rewriter.EntityPacketRewriter1_16_2;
 import com.viaversion.viaversion.protocols.v1_16_1to1_16_2.rewriter.ItemPacketRewriter1_16_2;
 import com.viaversion.viaversion.protocols.v1_16_1to1_16_2.rewriter.WorldPacketRewriter1_16_2;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -40,6 +41,7 @@ public class Protocol1_16_1To1_16_2 extends AbstractProtocol<ClientboundPackets1
     public static final MappingData1_16_2 MAPPINGS = new MappingData1_16_2();
     private final EntityPacketRewriter1_16_2 entityRewriter = new EntityPacketRewriter1_16_2(this);
     private final ItemPacketRewriter1_16_2 itemRewriter = new ItemPacketRewriter1_16_2(this);
+    private final ParticleRewriter<ClientboundPackets1_16> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_16> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_16_1To1_16_2() {
@@ -53,6 +55,7 @@ public class Protocol1_16_1To1_16_2 extends AbstractProtocol<ClientboundPackets1
         WorldPacketRewriter1_16_2.register(this);
 
         tagRewriter.register(ClientboundPackets1_16.UPDATE_TAGS, RegistryType.ENTITY);
+        particleRewriter.registerLevelParticles1_13(ClientboundPackets1_16.LEVEL_PARTICLES, Types.DOUBLE);
 
         new StatisticsRewriter<>(this).register(ClientboundPackets1_16.AWARD_STATS);
 
@@ -111,8 +114,13 @@ public class Protocol1_16_1To1_16_2 extends AbstractProtocol<ClientboundPackets1
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_16> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_16> getTagRewriter() {
         return tagRewriter;
     }
-}
+}

common/src/main/java/com/viaversion/viaversion/protocols/v1_16_1to1_16_2/rewriter/ItemPacketRewriter1_16_2.java

@@ -57,7 +57,5 @@ public class ItemPacketRewriter1_16_2 extends ItemRewriter<ClientboundPackets1_1
         registerContainerClick(ServerboundPackets1_16_2.CONTAINER_CLICK);
         registerSetCreativeModeSlot(ServerboundPackets1_16_2.SET_CREATIVE_MODE_SLOT);
         protocol.registerServerbound(ServerboundPackets1_16_2.EDIT_BOOK, wrapper -> handleItemToServer(wrapper.user(), wrapper.passthrough(Types.ITEM1_13_2)));
-
-        registerLevelParticles(ClientboundPackets1_16.LEVEL_PARTICLES, Types.DOUBLE);
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_16_4to1_17/Protocol1_16_4To1_17.java

@@ -37,6 +37,7 @@ import com.viaversion.viaversion.protocols.v1_16_4to1_17.packet.ServerboundPacke
 import com.viaversion.viaversion.protocols.v1_16_4to1_17.rewriter.EntityPacketRewriter1_17;
 import com.viaversion.viaversion.protocols.v1_16_4to1_17.rewriter.ItemPacketRewriter1_17;
 import com.viaversion.viaversion.protocols.v1_16_4to1_17.rewriter.WorldPacketRewriter1_17;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -46,6 +47,7 @@ public final class Protocol1_16_4To1_17 extends AbstractProtocol<ClientboundPack
     public static final MappingData MAPPINGS = new MappingDataBase("1.16.2", "1.17");
     private final EntityPacketRewriter1_17 entityRewriter = new EntityPacketRewriter1_17(this);
     private final ItemPacketRewriter1_17 itemRewriter = new ItemPacketRewriter1_17(this);
+    private final ParticleRewriter<ClientboundPackets1_16_2> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_16_2> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_16_4To1_17() {
@@ -86,6 +88,8 @@ public final class Protocol1_16_4To1_17 extends AbstractProtocol<ClientboundPack
         soundRewriter.registerSound(ClientboundPackets1_16_2.SOUND);
         soundRewriter.registerSound(ClientboundPackets1_16_2.SOUND_ENTITY);
 
+        particleRewriter.registerLevelParticles1_13(ClientboundPackets1_16_2.LEVEL_PARTICLES, Types.DOUBLE);
+
         registerClientbound(ClientboundPackets1_16_2.RESOURCE_PACK, wrapper -> {
             wrapper.passthrough(Types.STRING);
             wrapper.passthrough(Types.STRING);
@@ -208,6 +212,11 @@ public final class Protocol1_16_4To1_17 extends AbstractProtocol<ClientboundPack
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_16_2> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_16_2> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_16_4to1_17/rewriter/ItemPacketRewriter1_17.java

@@ -46,7 +46,6 @@ public final class ItemPacketRewriter1_17 extends ItemRewriter<ClientboundPacket
         registerSetSlot(ClientboundPackets1_16_2.CONTAINER_SET_SLOT);
         registerAdvancements(ClientboundPackets1_16_2.UPDATE_ADVANCEMENTS);
         registerSetEquipment(ClientboundPackets1_16_2.SET_EQUIPMENT);
-        registerLevelParticles(ClientboundPackets1_16_2.LEVEL_PARTICLES, Types.DOUBLE);
 
         new RecipeRewriter<>(protocol).register(ClientboundPackets1_16_2.UPDATE_RECIPES);
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_17_1to1_18/Protocol1_17_1To1_18.java

@@ -35,6 +35,7 @@ import com.viaversion.viaversion.protocols.v1_17_1to1_18.rewriter.ItemPacketRewr
 import com.viaversion.viaversion.protocols.v1_17_1to1_18.rewriter.WorldPacketRewriter1_18;
 import com.viaversion.viaversion.protocols.v1_17_1to1_18.storage.ChunkLightStorage;
 import com.viaversion.viaversion.protocols.v1_17to1_17_1.packet.ClientboundPackets1_17_1;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -46,6 +47,7 @@ public final class Protocol1_17_1To1_18 extends AbstractProtocol<ClientboundPack
     public static final ProtocolLogger LOGGER = new ProtocolLogger(Protocol1_17_1To1_18.class);
     private final EntityPacketRewriter1_18 entityRewriter = new EntityPacketRewriter1_18(this);
     private final ItemPacketRewriter1_18 itemRewriter = new ItemPacketRewriter1_18(this);
+    private final ParticleRewriter<ClientboundPackets1_17_1> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_17_1> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_17_1To1_18() {
@@ -123,8 +125,13 @@ public final class Protocol1_17_1To1_18 extends AbstractProtocol<ClientboundPack
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_17_1> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_17_1> getTagRewriter() {
         return tagRewriter;
     }
-}
+}

common/src/main/java/com/viaversion/viaversion/protocols/v1_17_1to1_18/rewriter/EntityPacketRewriter1_18.java

@@ -90,7 +90,7 @@ public final class EntityPacketRewriter1_18 extends EntityRewriter<ClientboundPa
             } else if (particle.id() == 3) { // Light block
                 particle.add(Types.VAR_INT, 7786); // Light block state
             } else {
-                rewriteParticle(event.user(), particle);
+                protocol.getParticleRewriter().rewriteParticle(event.user(), particle);
             }
         });
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_17_1to1_18/rewriter/WorldPacketRewriter1_18.java

@@ -168,6 +168,7 @@ public final class WorldPacketRewriter1_18 {
                 lightStorage.getLight(chunk.getX(), chunk.getZ()) : lightStorage.removeLight(chunk.getX(), chunk.getZ());
             if (light == null) {
                 protocol.getLogger().warning("No light data found for chunk at " + chunk.getX() + ", " + chunk.getZ() + ". Chunk was already loaded: " + alreadyLoaded);
+                protocol.getLogger().warning("This means another plugin is sending chunk data in a bad order, or you need to re-enable the cache-1_17-light config option.");
 
                 final BitSet emptyLightMask = new BitSet();
                 emptyLightMask.set(0, tracker.currentWorldSectionHeight() + 2);

common/src/main/java/com/viaversion/viaversion/protocols/v1_17_1to1_18/storage/ChunkLightStorage.java

@@ -18,6 +18,7 @@
 package com.viaversion.viaversion.protocols.v1_17_1to1_18.storage;
 
 import com.viaversion.viaversion.api.connection.StorableObject;
+import com.viaversion.viaversion.api.minecraft.ChunkPosition;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -30,27 +31,27 @@ public final class ChunkLightStorage implements StorableObject {
     private final Set<Long> loadedChunks = new HashSet<>();
 
     public void storeLight(final int x, final int z, final ChunkLight chunkLight) {
-        lightPackets.put(getChunkSectionIndex(x, z), chunkLight);
+        lightPackets.put(ChunkPosition.chunkKey(x, z), chunkLight);
     }
 
     public @Nullable ChunkLight removeLight(final int x, final int z) {
-        return lightPackets.remove(getChunkSectionIndex(x, z));
+        return lightPackets.remove(ChunkPosition.chunkKey(x, z));
     }
 
     public @Nullable ChunkLight getLight(final int x, final int z) {
-        return lightPackets.get(getChunkSectionIndex(x, z));
+        return lightPackets.get(ChunkPosition.chunkKey(x, z));
     }
 
     public boolean addLoadedChunk(final int x, final int z) {
-        return loadedChunks.add(getChunkSectionIndex(x, z));
+        return loadedChunks.add(ChunkPosition.chunkKey(x, z));
     }
 
     public boolean isLoaded(final int x, final int z) {
-        return loadedChunks.contains(getChunkSectionIndex(x, z));
+        return loadedChunks.contains(ChunkPosition.chunkKey(x, z));
     }
 
     public void clear(final int x, final int z) {
-        final long index = getChunkSectionIndex(x, z);
+        final long index = ChunkPosition.chunkKey(x, z);
         lightPackets.remove(index);
         loadedChunks.remove(index);
     }
@@ -60,10 +61,6 @@ public final class ChunkLightStorage implements StorableObject {
         lightPackets.clear();
     }
 
-    private long getChunkSectionIndex(final int x, final int z) {
-        return ((x & 0x3FFFFFFL) << 38) | (z & 0x3FFFFFFL);
-    }
-
     public record ChunkLight(boolean trustEdges, long[] skyLightMask, long[] blockLightMask,
                              long[] emptySkyLightMask, long[] emptyBlockLightMask,
                              byte[][] skyLight, byte[][] blockLight) {

common/src/main/java/com/viaversion/viaversion/protocols/v1_17to1_17_1/Protocol1_17To1_17_1.java

@@ -92,7 +92,9 @@ public final class Protocol1_17To1_17_1 extends AbstractProtocol<ClientboundPack
             ListTag<StringTag> pagesTag = new ListTag<>(StringTag.class);
             for (int i = 0; i < pages; i++) {
                 String page = wrapper.read(PAGE_STRING_TYPE);
-                pagesTag.add(new StringTag(page));
+                if (i < 200) { // Apply network limit as per game code
+                    pagesTag.add(new StringTag(page));
+                }
             }
 
             // Legacy servers don't like an empty pages list

common/src/main/java/com/viaversion/viaversion/protocols/v1_18_2to1_19/Protocol1_18_2To1_19.java

@@ -45,6 +45,7 @@ import com.viaversion.viaversion.protocols.v1_18_2to1_19.storage.DimensionRegist
 import com.viaversion.viaversion.protocols.v1_18_2to1_19.storage.NonceStorage1_19;
 import com.viaversion.viaversion.protocols.v1_18_2to1_19.storage.SequenceStorage;
 import com.viaversion.viaversion.rewriter.CommandRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -57,6 +58,7 @@ public final class Protocol1_18_2To1_19 extends AbstractProtocol<ClientboundPack
     public static final MappingData1_19 MAPPINGS = new MappingData1_19();
     private final EntityPacketRewriter1_19 entityRewriter = new EntityPacketRewriter1_19(this);
     private final ItemPacketRewriter1_19 itemRewriter = new ItemPacketRewriter1_19(this);
+    private final ParticleRewriter<ClientboundPackets1_18> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_18> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_18_2To1_19() {
@@ -347,6 +349,11 @@ public final class Protocol1_18_2To1_19 extends AbstractProtocol<ClientboundPack
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_18> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_18> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_18_2to1_19/rewriter/EntityPacketRewriter1_19.java

@@ -331,7 +331,7 @@ public final class EntityPacketRewriter1_19 extends EntityRewriter<ClientboundPa
                 }
             }
 
-            rewriteParticle(event.user(), particle);
+            protocol.getParticleRewriter().rewriteParticle(event.user(), particle);
         });
 
         registerEntityDataTypeHandler(Types1_19.ENTITY_DATA_TYPES.itemType, Types1_19.ENTITY_DATA_TYPES.optionalBlockStateType, null);
@@ -349,4 +349,4 @@ public final class EntityPacketRewriter1_19 extends EntityRewriter<ClientboundPa
     public EntityType typeFromId(final int type) {
         return EntityTypes1_19.getTypeFromId(type);
     }
-}
+}

common/src/main/java/com/viaversion/viaversion/protocols/v1_18_2to1_19/rewriter/ItemPacketRewriter1_19.java

@@ -69,7 +69,7 @@ public final class ItemPacketRewriter1_19 extends ItemRewriter<ClientboundPacket
                         }
                     }
                 });
-                handler(levelParticlesHandler(Types.VAR_INT));
+                handler(protocol.getParticleRewriter().levelParticlesHandler1_13(Types.VAR_INT));
             }
         });
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_1to1_19_3/Protocol1_19_1To1_19_3.java

@@ -52,6 +52,7 @@ import com.viaversion.viaversion.protocols.v1_19_1to1_19_3.storage.ReceivedMessa
 import com.viaversion.viaversion.protocols.v1_19to1_19_1.packet.ClientboundPackets1_19_1;
 import com.viaversion.viaversion.protocols.v1_19to1_19_1.packet.ServerboundPackets1_19_1;
 import com.viaversion.viaversion.rewriter.CommandRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
 import com.viaversion.viaversion.util.ComponentUtil;
@@ -68,6 +69,7 @@ public final class Protocol1_19_1To1_19_3 extends AbstractProtocol<ClientboundPa
     private static final byte[] EMPTY_BYTES = new byte[0];
     private final EntityPacketRewriter1_19_3 entityRewriter = new EntityPacketRewriter1_19_3(this);
     private final ItemPacketRewriter1_19_3 itemRewriter = new ItemPacketRewriter1_19_3(this);
+    private final ParticleRewriter<ClientboundPackets1_19_1> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_19_1> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_19_1To1_19_3() {
@@ -78,6 +80,8 @@ public final class Protocol1_19_1To1_19_3 extends AbstractProtocol<ClientboundPa
     protected void registerPackets() {
         tagRewriter.registerGeneric(ClientboundPackets1_19_1.UPDATE_TAGS);
 
+        particleRewriter.registerLevelParticles1_19(ClientboundPackets1_19_1.LEVEL_PARTICLES);
+
         entityRewriter.register();
         itemRewriter.register();
 
@@ -380,6 +384,11 @@ public final class Protocol1_19_1To1_19_3 extends AbstractProtocol<ClientboundPa
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_19_1> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_19_1> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_1to1_19_3/rewriter/EntityPacketRewriter1_19_3.java

@@ -22,6 +22,7 @@ import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_19_3;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.version.Types1_19;
 import com.viaversion.viaversion.api.type.types.version.Types1_19_3;
@@ -62,11 +63,16 @@ public final class EntityPacketRewriter1_19_3 extends EntityRewriter<Clientbound
                 handler(worldDataTrackerHandlerByKey());
                 handler(playerTrackerHandler());
                 handler(wrapper -> {
-                    // Also enable vanilla features
+                    // Also enable vanilla features (set by default in later versions, but keeping it explicit is nicer)
                     final PacketWrapper enableFeaturesPacket = wrapper.create(ClientboundPackets1_19_3.UPDATE_ENABLED_FEATURES);
-                    enableFeaturesPacket.write(Types.VAR_INT, 1);
-                    enableFeaturesPacket.write(Types.STRING, "minecraft:vanilla");
-                    enableFeaturesPacket.scheduleSend(Protocol1_19_1To1_19_3.class);
+                    enableFeaturesPacket.write(Types.STRING_ARRAY, new String[]{"minecraft:vanilla"});
+
+                    if (wrapper.user().getProtocolInfo().protocolVersion().newerThanOrEqualTo(ProtocolVersion.v1_20_2)) {
+                        // Make sure it's included in the configuration packets
+                        enableFeaturesPacket.send(Protocol1_19_1To1_19_3.class);
+                    } else {
+                        enableFeaturesPacket.scheduleSend(Protocol1_19_1To1_19_3.class);
+                    }
                 });
             }
         });

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_1to1_19_3/rewriter/ItemPacketRewriter1_19_3.java

@@ -56,7 +56,6 @@ public final class ItemPacketRewriter1_19_3 extends ItemRewriter<ClientboundPack
         registerMerchantOffers1_19(ClientboundPackets1_19_1.MERCHANT_OFFERS);
         registerSetCreativeModeSlot(ServerboundPackets1_19_3.SET_CREATIVE_MODE_SLOT);
         registerContainerSetData(ClientboundPackets1_19_1.CONTAINER_SET_DATA);
-        registerLevelParticles1_19(ClientboundPackets1_19_1.LEVEL_PARTICLES);
 
         final RecipeRewriter<ClientboundPackets1_19_1> recipeRewriter = new RecipeRewriter<>(protocol);
         protocol.registerClientbound(ClientboundPackets1_19_1.UPDATE_RECIPES, wrapper -> {

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_1to1_19_3/rewriter/RecipeRewriter1_19_3.java

@@ -50,7 +50,7 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         wrapper.passthrough(Types.STRING); // Group
         wrapper.passthrough(Types.VAR_INT); // Crafting book category
         handleIngredients(wrapper);
-        wrapper.write(mappedItemType(), rewrite(wrapper.user(), wrapper.read(itemType())));
+        handleResult(wrapper);
     }
 
     @Override
@@ -61,8 +61,7 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         for (int i = 0; i < ingredients; i++) {
             handleIngredient(wrapper);
         }
-        final Item result = rewrite(wrapper.user(), wrapper.read(itemType()));
-        wrapper.write(mappedItemType(), result);
+        handleResult(wrapper);
     }
 
     @Override
@@ -70,8 +69,7 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         wrapper.passthrough(Types.STRING); // Group
         wrapper.passthrough(Types.VAR_INT); // Crafting book category
         handleIngredient(wrapper);
-        final Item result = rewrite(wrapper.user(), wrapper.read(itemType()));
-        wrapper.write(mappedItemType(), result);
+        handleResult(wrapper);
         wrapper.passthrough(Types.FLOAT); // EXP
         wrapper.passthrough(Types.VAR_INT); // Cooking time
     }

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_3to1_19_4/Protocol1_19_3To1_19_4.java

@@ -22,7 +22,6 @@ import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_19_4;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
-import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
 import com.viaversion.viaversion.api.type.types.version.Types1_19_4;
@@ -36,6 +35,7 @@ import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.rewriter.EntityPacket
 import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.rewriter.ItemPacketRewriter1_19_4;
 import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.storage.PlayerVehicleTracker;
 import com.viaversion.viaversion.rewriter.CommandRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -48,6 +48,7 @@ public final class Protocol1_19_3To1_19_4 extends AbstractProtocol<ClientboundPa
     public static final MappingData1_19_4 MAPPINGS = new MappingData1_19_4();
     private final EntityPacketRewriter1_19_4 entityRewriter = new EntityPacketRewriter1_19_4(this);
     private final ItemPacketRewriter1_19_4 itemRewriter = new ItemPacketRewriter1_19_4(this);
+    private final ParticleRewriter<ClientboundPackets1_19_3> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_19_3> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_19_3To1_19_4() {
@@ -59,6 +60,8 @@ public final class Protocol1_19_3To1_19_4 extends AbstractProtocol<ClientboundPa
         super.registerPackets();
 
         tagRewriter.registerGeneric(ClientboundPackets1_19_3.UPDATE_TAGS);
+        particleRewriter.registerLevelParticles1_19(ClientboundPackets1_19_3.LEVEL_PARTICLES);
+
         new StatisticsRewriter<>(this).register(ClientboundPackets1_19_3.AWARD_STATS);
 
         final SoundRewriter<ClientboundPackets1_19_3> soundRewriter = new SoundRewriter<>(this);
@@ -133,6 +136,11 @@ public final class Protocol1_19_3To1_19_4 extends AbstractProtocol<ClientboundPa
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_19_3> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_19_3> getTagRewriter() {
         return tagRewriter;

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_3to1_19_4/rewriter/ItemPacketRewriter1_19_4.java

@@ -19,7 +19,6 @@ package com.viaversion.viaversion.protocols.v1_19_3to1_19_4.rewriter;
 
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
-import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_18;
 import com.viaversion.viaversion.protocols.v1_19_1to1_19_3.packet.ClientboundPackets1_19_3;
@@ -91,7 +90,6 @@ public final class ItemPacketRewriter1_19_4 extends ItemRewriter<ClientboundPack
         registerSetEquipment(ClientboundPackets1_19_3.SET_EQUIPMENT);
         registerMerchantOffers1_19(ClientboundPackets1_19_3.MERCHANT_OFFERS);
         registerContainerSetData(ClientboundPackets1_19_3.CONTAINER_SET_DATA);
-        registerLevelParticles1_19(ClientboundPackets1_19_3.LEVEL_PARTICLES);
         registerSetCreativeModeSlot(ServerboundPackets1_19_4.SET_CREATIVE_MODE_SLOT);
         registerContainerClick1_17_1(ServerboundPackets1_19_4.CONTAINER_CLICK);
 
@@ -103,4 +101,4 @@ public final class ItemPacketRewriter1_19_4 extends ItemRewriter<ClientboundPack
             }
         }.register(ClientboundPackets1_19_3.UPDATE_RECIPES);
     }
-}
+}

common/src/main/java/com/viaversion/viaversion/protocols/v1_19_4to1_20/Protocol1_19_4To1_20.java

@@ -31,6 +31,7 @@ import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.packet.ClientboundPac
 import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.packet.ServerboundPackets1_19_4;
 import com.viaversion.viaversion.protocols.v1_19_4to1_20.rewriter.EntityPacketRewriter1_20;
 import com.viaversion.viaversion.protocols.v1_19_4to1_20.rewriter.ItemPacketRewriter1_20;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -40,6 +41,7 @@ public final class Protocol1_19_4To1_20 extends AbstractProtocol<ClientboundPack
     public static final MappingData MAPPINGS = new MappingDataBase("1.19.4", "1.20");
     private final EntityPacketRewriter1_20 entityRewriter = new EntityPacketRewriter1_20(this);
     private final ItemPacketRewriter1_20 itemRewriter = new ItemPacketRewriter1_20(this);
+    private final ParticleRewriter<ClientboundPackets1_19_4> particleRewriter = new ParticleRewriter<>(this);
     private final TagRewriter<ClientboundPackets1_19_4> tagRewriter = new TagRewriter<>(this);
 
     public Protocol1_19_4To1_20() {
@@ -51,6 +53,7 @@ public final class Protocol1_19_4To1_20 extends AbstractProtocol<ClientboundPack
         super.registerPackets();
 
         tagRewriter.registerGeneric(ClientboundPackets1_19_4.UPDATE_TAGS);
+        particleRewriter.registerLevelParticles1_19(ClientboundPackets1_19_4.LEVEL_PARTICLES);
 
         final SoundRewriter<ClientboundPackets1_19_4> soundRewriter = new SoundRewriter<>(this);
         soundRewriter.registerSound1_19_3(ClientboundPackets1_19_4.SOUND);
@@ -108,8 +111,13 @@ public final class Protocol1_19_4To1_20 extends AbstractProtocol<ClientboundPack
         return itemRewriter;
     }
 
+    @Override
+    public ParticleRewriter<ClientboundPackets1_19_4> getParticleRewriter() {
+        return particleRewriter;
+    }
+
     @Override
     public TagRewriter<ClientboundPackets1_19_4> getTagRewriter() {
         return tagRewriter;
     }
-}
+}