5.8.0 Release

Preserves the amount the player actually had/saw at the end

.github/FUNDING.yml

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

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -50,21 +50,12 @@ body:
       label: Steps to Reproduce
       description: |
         List the steps on how we can reproduce the issue. Make sure we can easily understand what you mean with each step.
+        **Please always include the client version(s) with which the issue happens. Ideally also try to find out, from what specific version onward/in what version range the issue happens.**
       placeholder: |
         Example:
         1. Login with a 1.21.3 client
         2. Place a sign
-        3. The sign text is displayed wrong
-    validations:
-      required: true
-
-  - type: textarea
-    attributes:
-      label: Expected Behavior
-      description: |
-        Describe what exactly you expected to happen.
-      placeholder: |
-        Example: "Placed sign text should not disappear."
+        3. The sign text disappears
     validations:
       required: true
 

.github/dependabot.yml

@@ -1,6 +1,14 @@
 version: 2
 updates:
   - package-ecosystem: "github-actions"
+    cooldown:
+      default-days: 7
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
+  - package-ecosystem: "gradle"
+    cooldown:
+      default-days: 7
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/build.yml

@@ -1,23 +1,23 @@
-name: Java CI with Gradle
-
-on: [push, pull_request]
+name: Build
+on: [pull_request, push, workflow_dispatch]
+permissions:
+  contents: read
 
 jobs:
   build:
     # Only run on PRs if the source branch is on a different repo. We do not need to run everything twice.
     if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
-
     runs-on: ubuntu-24.04
-
+    timeout-minutes: 30
     steps:
     - name: Checkout Repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2
       with:
         persist-credentials: false
     - name: Set up Gradle
-      uses: gradle/actions/setup-gradle@v4
+      uses: gradle/actions/setup-gradle@f29f5a9d7b09a7c6b29859002d29d24e1674c884 # 5.0.1
     - name: Set up JDK 17
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # 5.2.0
       with:
         distribution: 'temurin'
         java-version: 17
@@ -26,8 +26,9 @@ jobs:
       run: ./gradlew build
     - name: Upload Artifacts to GitHub
       # Only upload on the preview repository as there is no CI job for it.
-      if: ${{ github.repository == 'ViaVersionDev' && github.ref_name == 'preview' }}
-      uses: actions/upload-artifact@v4
+      if: ${{ github.repository == 'ViaVersion/ViaVersionDev' && github.ref_name == 'preview' }}
+      uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # 6.0.0
       with:
         name: Artifacts
         path: build/libs/
+        if-no-files-found: error

.github/workflows/publish.yml

@@ -4,26 +4,38 @@ on:
     branches:
       - master
       - dev
+  workflow_dispatch:
+
+permissions:
+  contents: read
 
 jobs:
   publish:
     if: github.repository_owner == 'ViaVersion'
     runs-on: ubuntu-24.04
+    timeout-minutes: 30
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2
         with:
           persist-credentials: false
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@f29f5a9d7b09a7c6b29859002d29d24e1674c884 # 5.0.1
       - name: Set up JDK 17
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # 5.2.0
         with:
           distribution: 'temurin'
           java-version: 17
           check-latest: true
-      - name: Publish
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Publish to Hangar
         env:
           HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+        run: ./gradlew publishAllPublicationsToHangar --stacktrace
+        continue-on-error: true
+      - name: Publish to Modrinth
+        env:
           MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
-        run: ./gradlew build modrinth publishAllPublicationsToHangar --stacktrace
+        run: ./gradlew modrinth --stacktrace
+        continue-on-error: true

.github/workflows/update-gradle-wrapper.yml

@@ -1,16 +0,0 @@
-name: Update Gradle Wrapper
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 0 * * 0"
-
-jobs:
-  update-gradle-wrapper:
-    runs-on: ubuntu-24.04
-    steps:
-      - name: Checkout Repository
-        uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Update Gradle Wrapper
-        uses: gradle-update/update-gradle-wrapper-action@v2

.gitignore

@@ -1,115 +1,36 @@
-### Java files ###
-*.class
+# Gradle
 
-# Package Files
-#*.jar
-*.war
-*.ear
+.gradle/
+build/
+out/
+classes/
+.kotlin/
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+# Eclipse
 
+*.launch
 
+# Idea
 
-### Intellij ###
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
-# Ignore project files
-*.iml
-
-# Ignore IDEA directory
-.idea/*
+.idea/
 !.idea/copyright/*
 !.idea/scopes/*
-
-# Include the project's dictionary
-!.idea/dictionaries/
-!.idea/dictionaries/*
-
-# File-based project format:
+*.iml
 *.ipr
 *.iws
 
-### Plugin-specific files: ###
-# IntelliJ
-/out/
+# VSCode
 
-# mpeltonen/sbt-idea plugin
-.idea_modules/
-
-# JIRA plugin
-atlassian-ide-plugin.xml
-
-# Crashlytics plugin (for Android Studio and IntelliJ)
-com_crashlytics_export_strings.xml
-crashlytics.properties
-crashlytics-build.properties
-
-
-
-### Eclipse ###
-*.pydevproject
-.metadata
-.gradle
-bin/
-tmp/
-*.tmp
-*.bak
-*.swp
-*~.nib
-local.properties
 .settings/
-.loadpath
-
-# Eclipse Core
+.vscode/
+bin/
+.classpath
 .project
 
-# External tool builders
-.externalToolBuilders/
+# macOS
 
-# Locally stored "Eclipse launch configurations"
-*.launch
-
-# CDT-specific
-.cproject
-
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
-
-# PDT-specific
-.buildpath
-
-# sbteclipse plugin
-.target
-
-# TeXlipse plugin
-.texlipse
-
-
-
-### Maven ###
-target/
-pom.xml.tag
-pom.xml.releaseBackup
-pom.xml.versionsBackup
-pom.xml.next
-release.properties
-dependency-reduced-pom.xml
-buildNumber.properties
-
-
-
-### NetBeans ###
-nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-nb-configuration.xml
-.nb-gradle/
-
-### MacOS ###
 .DS_Store
 
-### Run Folder (ViaProxy) ###
-common/run/
+# Misc
+
+run/

README.md

@@ -7,25 +7,35 @@
 **Allows the connection of higher client versions to lower server versions -
 it works on any platform you can think of.**
 
-The base ViaVersion jar runs on Paper and Velocity. We also have projects integrating ViaVersion to run
-on Fabric, Forge, Bungee, Sponge, or as a standalone proxy to join from basically any client version on
-any server version from the past decade. **See [HERE](https://viaversion.com) for an overview of the different Via\* projects.**
+The base ViaVersion jar runs on [Paper](https://papermc.io/software/paper/)
+and [Velocity](https://papermc.io/software/velocity/). We also have projects integrating ViaVersion to run
+on [Fabric](https://github.com/ViaVersion/ViaFabric), [Forge](https://github.com/ViaVersion/ViaForge), [Bungee](https://github.com/ViaVersion/ViaBungee), [Sponge](https://github.com/ViaVersion/ViaSponge),
+or as [a standalone proxy](https://github.com/ViaVersion/ViaProxy) to join from basically any client version on
+any server version from the past decade. **See [HERE](https://viaversion.com) for an overview of the different Via\*
+projects.**
 
-Note that ViaVersion will be able to **run best on either Paper servers or through [ViaFabricPlus](https://github.com/ViaVersion/ViaFabricPlus?tab=readme-ov-file#viafabricplus)** due to having
+Note that ViaVersion will be able to **run best on either Paper servers or
+through [ViaFabricPlus](https://github.com/ViaVersion/ViaFabricPlus?tab=readme-ov-file#viafabricplus)** due to having
 direct access to client/server state and more extensive API.
 
 Supported Versions:
 
-![Table (https://i.imgur.com/zrQTcf0.png)](https://i.imgur.com/zrQTcf0.png)
+![Table (https://ci.viaversion.com/userContent/images/T.png)](https://ci.viaversion.com/userContent/images/T.png)
 
 **User Docs:** https://docs.viaversion.com
 
 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.
+**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
 --------
@@ -78,7 +88,7 @@ If you need access to the existing protocol or platform implementations, use the
 Please note the [differences in licensing](#license).
 
 Note: If you want to make your own platform implementation of ViaVersion (and additional addons),
-you can use the [ViaLoader](https://github.com/ViaVersion/ViaLoader) project.
+take a look at the [documentation](https://github.com/ViaVersion/ViaVersion/wiki/Creating-a-new-ViaVersion-platform).
 
 Building
 --------
@@ -87,11 +97,10 @@ of the `build/libs` directory.
 
 You need JDK 17 or newer to build ViaVersion.
 
-
 Mapping Files
 --------------
-Mapping files are generated and managed in our [Mappings repository](https://github.com/ViaVersion/Mappings). The generated mapping output is stored [here](./common/src/main/resources/assets/viaversion).
-
+Mapping files are generated and managed in our [Mappings repository](https://github.com/ViaVersion/Mappings). The
+generated mapping output is stored [here](./common/src/main/resources/assets/viaversion).
 
 Resources
 --------

SECURITY.md

@@ -0,0 +1,10 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a **security vulnerability**, please **do not** open a public issue. Instead, use one of the following **confidential contact methods**:
+
+* **Email:** [security@viaversion.com](mailto:security@viaversion.com)
+* **Discord:** Join our [Discord server](https://discord.gg/viaversion) and visit the [#exploit-report](https://discord.com/channels/316206679014244363/1388847764137316485) channel for further instructions.
+
+If your issue is **not security-related** (e.g., bug reports, feature requests, or usage questions), please use the [GitHub Issues page](https://github.com/ViaVersion/ViaVersion/issues) or contact us via the [Discord server](https://discord.gg/viaversion).

api/build.gradle.kts

@@ -29,7 +29,11 @@ dependencies {
     api(libs.snakeYaml)
 
     compileOnlyApi(libs.netty)
-    compileOnlyApi(libs.guava)
+    compileOnlyApi(libs.guava) {
+        exclude("com.google.errorprone", "error_prone_annotations")
+        exclude("org.jspecify", "jspecify")
+        exclude("com.google.j2objc", "j2objc-annotations")
+    }
     compileOnlyApi(libs.checkerQual)
 }
 

api/src/main/java-templates/com/viaversion/viaversion/util/VersionInfo.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
+ * Copyright (C) 2016-2025 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

api/src/main/java/com/viaversion/viaversion/api/Via.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -84,4 +84,8 @@ public final class Via {
         Preconditions.checkArgument(manager != null, "ViaVersion has not loaded the platform yet");
         return manager;
     }
+
+    public static boolean isLoaded() {
+        return manager != null;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/ViaAPI.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -123,7 +123,7 @@ public interface ViaAPI<T> {
     boolean isInjected(UUID uuid);
 
     /**
-     * Returns whether Via injected into this player connection. Note that this method may not work on
+     * Returns the injected UserConnection if present. Note that this method may not work on
      * clientside implementations and is generally not recommended to be used. Use {@link ConnectionManager} instead.
      *
      * @param uuid uuid of the player

api/src/main/java/com/viaversion/viaversion/api/ViaManager.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/command/UserConnectionViaCommandSender.java

@@ -0,0 +1,56 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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.command;
+
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import java.util.UUID;
+
+public class UserConnectionViaCommandSender implements ViaCommandSender {
+
+    private final UserConnection connection;
+
+    public UserConnectionViaCommandSender(final UserConnection connection) {
+        this.connection = connection;
+    }
+
+    @Override
+    public boolean hasPermission(String permission) {
+        return true;
+    }
+
+    @Override
+    public void sendMessage(String msg) {
+        Via.getPlatform().sendMessage(connection, msg);
+    }
+
+    @Override
+    public UUID getUUID() {
+        return connection.getProtocolInfo().getUuid();
+    }
+
+    @Override
+    public String getName() {
+        return connection.getProtocolInfo().getUsername();
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/command/ViaCommandSender.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/command/ViaSubCommand.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/command/ViaVersionCommand.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -0,0 +1,27 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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.configuration;
+
+public record RateLimitConfig(boolean enabled, int maxRate, String maxRateKickMessage, int warningRate, int maxWarnings,
+                              long trackingPeriodNanos, String warningKickMessage, String ratePlaceholder) {
+}

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -27,6 +27,7 @@ import com.viaversion.viaversion.api.connection.StorableObject;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.minecraft.WorldIdentifiers;
 import com.viaversion.viaversion.api.protocol.version.BlockedProtocolVersions;
+import java.util.concurrent.TimeUnit;
 
 public interface ViaVersionConfig extends Config {
 
@@ -67,11 +68,16 @@ public interface ViaVersionConfig extends Config {
     boolean isShowNewDeathMessages();
 
     /**
-     * Get if entity data errors will be suppressed
+     * Get if entity data errors will be logged
      *
-     * @return true if entity data errors suppression is enabled
+     * @return true if entity data error logging is enabled
      */
-    boolean isSuppressMetadataErrors();
+    boolean logEntityDataErrors();
+
+    @Deprecated(forRemoval = true)
+    default boolean isSuppressMetadataErrors() {
+        return !logEntityDataErrors();
+    }
 
     /**
      * Get if blocking in 1.9 & 1.10 appears as a player holding a shield
@@ -147,42 +153,64 @@ public interface ViaVersionConfig extends Config {
      *
      * @return The number of packets a client can send per second.
      */
-    int getMaxPPS();
+    @Deprecated(forRemoval = true)
+    default int getMaxPPS() {
+        return getPacketTrackerConfig().maxRate();
+    }
 
     /**
      * Get the kick message sent if the user hits the max packets per second.
      *
      * @return Kick message, with colour codes using '&'
      */
-    String getMaxPPSKickMessage();
+    @Deprecated(forRemoval = true)
+    default String getMaxPPSKickMessage() {
+        return getPacketTrackerConfig().maxRateKickMessage();
+    }
 
     /**
      * The time in seconds that should be tracked for warnings
      *
      * @return Time in seconds that should be tracked for warnings
      */
-    int getTrackingPeriod();
+    @Deprecated(forRemoval = true)
+    default int getTrackingPeriod() {
+        return (int) TimeUnit.NANOSECONDS.toSeconds(getPacketTrackerConfig().trackingPeriodNanos());
+    }
 
     /**
      * The number of packets per second to count as a warning
      *
      * @return The number of packets per second to count as a warning.
      */
-    int getWarningPPS();
+    @Deprecated(forRemoval = true)
+    default int getWarningPPS() {
+        return getPacketTrackerConfig().warningRate();
+    }
 
     /**
      * Get the maximum number of warnings the client can have in the interval
      *
      * @return The number of packets a client can send per second.
      */
-    int getMaxWarnings();
+    @Deprecated(forRemoval = true)
+    default int getMaxWarnings() {
+        return getPacketTrackerConfig().maxWarnings();
+    }
 
     /**
      * Get the kick message sent if the user goes over the warnings in the interval
      *
      * @return Kick message, with colour codes using '&'
      */
-    String getMaxWarningsKickMessage();
+    @Deprecated(forRemoval = true)
+    default String getMaxWarningsKickMessage() {
+        return getPacketTrackerConfig().warningKickMessage();
+    }
+
+    RateLimitConfig getPacketTrackerConfig();
+
+    RateLimitConfig getPacketSizeTrackerConfig();
 
     /**
      * Send supported versions in the status response packet
@@ -233,13 +261,6 @@ public interface ViaVersionConfig extends Config {
      */
     boolean isChunkBorderFix();
 
-    /**
-     * Should we fix nbt array's in json chat messages for 1.12 clients
-     *
-     * @return true if enabled
-     */
-    boolean is1_12NBTArrayFix();
-
     /**
      * Should we make team colours based on the last colour in team prefix
      *
@@ -270,6 +291,8 @@ public interface ViaVersionConfig extends Config {
      */
     String getBlockedDisconnectMsg();
 
+    boolean logBlockedJoins();
+
     /**
      * Get the message sent to players being kicked on reload.
      * Players are kicked to stop the server crashing
@@ -279,11 +302,28 @@ public interface ViaVersionConfig extends Config {
     String getReloadDisconnectMsg();
 
     /**
-     * Should we hide errors that occur when trying to convert block and item data over versions?
+     * Should we log warnings on issues when trying to convert data over versions?
      *
      * @return true if enabled
      */
-    boolean isSuppressConversionWarnings();
+    boolean logOtherConversionWarnings();
+
+    /**
+     * Should we log errors that occur when trying to convert text components?
+     *
+     * @return true if enabled
+     */
+    boolean logTextComponentConversionErrors();
+
+    @Deprecated(forRemoval = true)
+    default boolean isSuppressConversionWarnings() {
+        return !logOtherConversionWarnings();
+    }
+
+    @Deprecated(forRemoval = true)
+    default boolean isSuppressTextComponentConversionWarnings() {
+        return !logTextComponentConversionErrors();
+    }
 
     /**
      * Should we disable the 1.13 auto-complete feature to stop spam kicks? (for any server lower than 1.13)
@@ -478,4 +518,41 @@ public interface ViaVersionConfig extends Config {
      * @return true if enabled
      */
     boolean fix1_21PlacementRotation();
+
+    /**
+     * If enabled, cancel swing packets sent while having an inventory opened on 1.15.2 and below servers.
+     * This can cause false positives with anti-cheat plugins.
+     *
+     * @return true if enabled
+     */
+    boolean cancelSwingInInventory();
+
+    /**
+     * Returns the max length of error messages. Longer messages will be truncated unless in debug mode.
+     *
+     * @return the max length of error messages
+     */
+    int maxErrorLength();
+
+    /**
+     * If enabled, 1.21.11+ clients on 1.8 (or older) servers will get wider entity hitboxes,
+     * but only when attacking with an item.
+     *
+     * @return true if enabled
+     */
+    boolean use1_8HitboxMargin();
+
+    /**
+     * If enabled, ViaVersion will send the native client version to the server on connect via a plugin message.
+     *
+     * @return true if enabled
+     */
+    boolean sendPlayerDetails();
+
+    /**
+     * If enabled, ViaVersion will send the native server version to a player on connect via a plugin message.
+     *
+     * @return true if enabled
+     */
+    boolean sendServerDetails();
 }

api/src/main/java/com/viaversion/viaversion/api/connection/ConnectionManager.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/connection/ProtocolInfo.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -134,6 +134,15 @@ public interface ProtocolInfo {
 
     void setUuid(UUID uuid);
 
+    /**
+     * Returns whether compression is enabled for this connection.
+     *
+     * @return whether compression is enabled
+     */
+    boolean compressionEnabled();
+
+    void setCompressionEnabled(boolean compressionEnabled);
+
     /**
      * Returns the user's pipeline.
      *

api/src/main/java/com/viaversion/viaversion/api/connection/StorableObject.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -30,15 +30,6 @@ package com.viaversion.viaversion.api.connection;
  */
 public interface StorableObject {
 
-    /**
-     * Returns whether the object should be uncached on a server switch.
-     *
-     * @return whether the object should be uncached on a server switch
-     */
-    default boolean clearOnServerSwitch() {
-        return true;
-    }
-
     default void onRemove() {
     }
 }

api/src/main/java/com/viaversion/viaversion/api/connection/StoredObject.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/connection/UserConnection.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -24,6 +24,7 @@ package com.viaversion.viaversion.api.connection;
 
 import com.viaversion.viaversion.api.configuration.ViaVersionConfig;
 import com.viaversion.viaversion.api.data.entity.EntityTracker;
+import com.viaversion.viaversion.api.data.item.ItemHasher;
 import com.viaversion.viaversion.api.minecraft.ClientWorld;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.PacketTracker;
@@ -99,6 +100,23 @@ public interface UserConnection {
      */
     void addEntityTracker(Class<? extends Protocol> protocolClass, EntityTracker tracker);
 
+    /**
+     * Adds an item hasher to the user connection.
+     *
+     * @param protocolClass protocol class
+     * @param itemHasher   item hasher
+     */
+    void addItemHasher(Class<? extends Protocol> protocolClass, ItemHasher itemHasher);
+
+    /**
+     * Returns the item hasher by the given protocol class if present.
+     *
+     * @param protocolClass protocol class
+     * @param <T>           item hasher type
+     * @return item hasher if present
+     */
+    @Nullable <T extends ItemHasher> T getItemHasher(Class<? extends Protocol> protocolClass);
+
     /**
      * Returns the client world by the given protocol class if present.
      *
@@ -121,17 +139,7 @@ public interface UserConnection {
     /**
      * Clear stored objects, entity trackers and client worlds.
      */
-    default void clearStoredObjects() {
-        clearStoredObjects(false);
-    }
-
-    /**
-     * Clear stored objects, entity trackers and client worlds.
-     * If cleared for a proxy server switch, some stored objects and tracker data will be retained.
-     *
-     * @param isServerSwitch whether the clear is due to a server switch
-     */
-    void clearStoredObjects(boolean isServerSwitch);
+    void clearStoredObjects();
 
     /**
      * Sends a raw packet to the connection on the current thread.
@@ -186,9 +194,15 @@ public interface UserConnection {
     /**
      * Monitors serverbound packets and returns whether a packet can/should be processed.
      *
+     * @param bytes the number of bytes in the packet
      * @return false if this packet should be cancelled
      */
-    boolean checkServerboundPacket();
+    boolean checkServerboundPacket(int bytes);
+
+    @Deprecated(forRemoval = true)
+    default boolean checkServerboundPacket() {
+        return checkServerboundPacket(0);
+    }
 
     /**
      * Monitors clientbound packets and returns whether a packet can/should be processed.
@@ -201,6 +215,11 @@ public interface UserConnection {
      * @see #checkClientboundPacket()
      * @see #checkServerboundPacket()
      */
+    default boolean checkIncomingPacket(final int bytes) {
+        return isClientSide() ? checkClientboundPacket() : checkServerboundPacket(bytes);
+    }
+
+    @Deprecated(forRemoval = true)
     default boolean checkIncomingPacket() {
         return isClientSide() ? checkClientboundPacket() : checkServerboundPacket();
     }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/Int2IntMapBiMappings.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/Int2IntMapMappings.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -22,9 +22,13 @@
  */
 package com.viaversion.viaversion.api.data;
 
+import com.viaversion.viaversion.api.minecraft.RegistryKey;
 import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.TagData;
+import com.viaversion.viaversion.util.Key;
+import it.unimi.dsi.fastutil.ints.IntSet;
 import java.util.List;
+import java.util.Locale;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface MappingData {
@@ -140,12 +144,14 @@ public interface MappingData {
 
     @Nullable Mappings getBlockMappings();
 
-    @Nullable Mappings getBlockEntityMappings();
+    @Nullable FullMappings getFullBlockMappings();
 
     @Nullable Mappings getBlockStateMappings();
 
     @Nullable Mappings getSoundMappings();
 
+    @Nullable FullMappings getFullSoundMappings();
+
     @Nullable Mappings getStatisticsMappings();
 
     @Nullable Mappings getMenuMappings();
@@ -154,6 +160,8 @@ public interface MappingData {
 
     @Nullable Mappings getPaintingMappings();
 
+    @Nullable FullMappings getBlockEntityMappings();
+
     @Nullable FullMappings getAttributeMappings();
 
     @Nullable FullMappings getEntityMappings();
@@ -162,5 +170,35 @@ public interface MappingData {
 
     @Nullable FullMappings getRecipeSerializerMappings();
 
+    @Nullable FullMappings getSlotDisplayMappings();
+
     @Nullable FullMappings getDataComponentSerializerMappings();
+
+    default @Nullable FullMappings getFullMappings(final MappingType mappingType) {
+        return switch (mappingType) {
+            case ITEM -> getFullItemMappings();
+            case BLOCK -> getFullBlockMappings();
+            case SOUND -> getFullSoundMappings();
+            case ENTITY_TYPE -> getEntityMappings();
+        };
+    }
+
+    /**
+     * Set of block (not block state) ids that had their base type or properties changed.
+     *
+     * @return set of changed block ids, or null if not tracked/none are present
+     */
+    @Nullable IntSet changedBlocks();
+
+    /**
+     * Type of mappings. Currently only relevant for ops writing of generic holder classes and expanded when needed.
+     */
+    enum MappingType implements RegistryKey {
+        ITEM, BLOCK, SOUND, ENTITY_TYPE;
+
+        @Override
+        public Key key() {
+            return Key.of(name().toLowerCase(Locale.ROOT));
+        }
+    }
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -28,6 +28,8 @@ import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.TagData;
+import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
+import it.unimi.dsi.fastutil.ints.IntSet;
 import java.util.ArrayList;
 import java.util.EnumMap;
 import java.util.List;
@@ -43,18 +45,23 @@ public class MappingDataBase implements MappingData {
     protected FullMappings entityMappings;
     protected FullMappings recipeSerializerMappings;
     protected FullMappings itemDataSerializerMappings;
+    protected FullMappings slotDisplayMappings;
     protected FullMappings attributeMappings;
+    protected FullMappings blockEntityMappings;
     protected ParticleMappings particleMappings;
     protected BiMappings itemMappings;
     protected BiMappings blockMappings;
     protected Mappings blockStateMappings;
-    protected Mappings blockEntityMappings;
     protected Mappings soundMappings;
     protected Mappings statisticsMappings;
     protected Mappings enchantmentMappings;
     protected Mappings paintingMappings;
     protected Mappings menuMappings;
     protected Map<RegistryType, List<TagData>> tags;
+    /**
+     * Set of block ids that have had type or property changes.
+     */
+    protected IntSet changedBlocks;
 
     public MappingDataBase(final String unmappedVersion, final String mappedVersion) {
         this.unmappedVersion = unmappedVersion;
@@ -68,10 +75,7 @@ public class MappingDataBase implements MappingData {
         }
 
         final CompoundTag data = readMappingsFile("mappings-" + unmappedVersion + "to" + mappedVersion + ".nbt");
-        blockMappings = loadBiMappings(data, "blocks");
         blockStateMappings = loadMappings(data, "blockstates");
-        blockEntityMappings = loadMappings(data, "blockentities");
-        soundMappings = loadMappings(data, "sounds");
         statisticsMappings = loadMappings(data, "statistics");
         menuMappings = loadMappings(data, "menus");
         enchantmentMappings = loadMappings(data, "enchantments");
@@ -80,12 +84,17 @@ public class MappingDataBase implements MappingData {
         final CompoundTag unmappedIdentifierData = readUnmappedIdentifiersFile("identifiers-" + unmappedVersion + ".nbt");
         final CompoundTag mappedIdentifierData = readMappedIdentifiersFile("identifiers-" + mappedVersion + ".nbt");
         if (unmappedIdentifierData != null && mappedIdentifierData != null) {
-            itemMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "items");
+            itemMappings = loadFullOrBiMappings(data, unmappedIdentifierData, mappedIdentifierData, "items");
+            blockMappings = loadFullOrBiMappings(data, unmappedIdentifierData, mappedIdentifierData, "blocks");
+            soundMappings = loadFullOrBiMappings(data, unmappedIdentifierData, mappedIdentifierData, "sounds");
+
             entityMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "entities");
             argumentTypeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "argumenttypes");
+            slotDisplayMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "slot_displays");
             recipeSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "recipe_serializers");
             itemDataSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "data_component_type");
             attributeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "attributes");
+            blockEntityMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "blockentities");
 
             final List<String> unmappedParticles = identifiersFromGlobalIds(unmappedIdentifierData, "particles");
             final List<String> mappedParticles = identifiersFromGlobalIds(mappedIdentifierData, "particles");
@@ -99,6 +108,8 @@ public class MappingDataBase implements MappingData {
         } else {
             // Might not have identifiers in older versions
             itemMappings = loadBiMappings(data, "items");
+            blockMappings = loadBiMappings(data, "blocks");
+            soundMappings = loadMappings(data, "sounds");
         }
 
         final CompoundTag tagsTag = data.getCompoundTag("tags");
@@ -109,6 +120,11 @@ public class MappingDataBase implements MappingData {
             loadTags(RegistryType.ENTITY, tagsTag);
         }
 
+        final IntArrayTag changedBlocks = data.getIntArrayTag("changed_blocks");
+        if (changedBlocks != null) {
+            this.changedBlocks = new IntOpenHashSet(changedBlocks.getValue());
+        }
+
         loadExtras(data);
     }
 
@@ -132,6 +148,11 @@ public class MappingDataBase implements MappingData {
         return MappingDataLoader.INSTANCE.loadMappings(data, key);
     }
 
+    protected @Nullable BiMappings loadFullOrBiMappings(final CompoundTag data, final CompoundTag unmappedIdentifiersTag, final CompoundTag mappedIdentifiersTag, final String key) {
+        final FullMappings mappings = loadFullMappings(data, unmappedIdentifiersTag, mappedIdentifiersTag, key);
+        return mappings != null ? mappings : loadBiMappings(data, key);
+    }
+
     protected @Nullable FullMappings loadFullMappings(final CompoundTag data, final CompoundTag unmappedIdentifiersTag, final CompoundTag mappedIdentifiersTag, final String key) {
         if (!unmappedIdentifiersTag.contains(key) || !mappedIdentifiersTag.contains(key)) {
             return null;
@@ -153,7 +174,7 @@ public class MappingDataBase implements MappingData {
     }
 
     private void loadTags(final RegistryType type, final CompoundTag data) {
-        final CompoundTag tag = data.getCompoundTag(type.resourceLocation());
+        final CompoundTag tag = data.getCompoundTag(type.identifier());
         if (tag == null) {
             return;
         }
@@ -208,8 +229,8 @@ public class MappingDataBase implements MappingData {
     }
 
     @Override
-    public int getOldSoundId(final int i) {
-        return soundMappings.getNewIdOrDefault(i, 0);
+    public int getOldSoundId(final int id) {
+        return soundMappings.inverse().getNewIdOrDefault(id, 0);
     }
 
     @Override
@@ -224,8 +245,8 @@ public class MappingDataBase implements MappingData {
 
     @Override
     public @Nullable FullMappings getFullItemMappings() {
-        if (itemMappings instanceof FullMappings) {
-            return (FullMappings) itemMappings;
+        if (itemMappings instanceof FullMappings fullItemMappings) {
+            return fullItemMappings;
         }
         return null;
     }
@@ -241,7 +262,15 @@ public class MappingDataBase implements MappingData {
     }
 
     @Override
-    public @Nullable Mappings getBlockEntityMappings() {
+    public @Nullable FullMappings getFullBlockMappings() {
+        if (blockMappings instanceof FullMappings fullBlockMappings) {
+            return fullBlockMappings;
+        }
+        return null;
+    }
+
+    @Override
+    public @Nullable FullMappings getBlockEntityMappings() {
         return blockEntityMappings;
     }
 
@@ -255,6 +284,14 @@ public class MappingDataBase implements MappingData {
         return soundMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getFullSoundMappings() {
+        if (soundMappings instanceof FullMappings fullSoundMappings) {
+            return fullSoundMappings;
+        }
+        return null;
+    }
+
     @Override
     public @Nullable Mappings getStatisticsMappings() {
         return statisticsMappings;
@@ -300,6 +337,16 @@ public class MappingDataBase implements MappingData {
         return recipeSerializerMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getSlotDisplayMappings() {
+        return slotDisplayMappings;
+    }
+
+    @Override
+    public @Nullable IntSet changedBlocks() {
+        return changedBlocks;
+    }
+
     protected Logger getLogger() {
         return Via.getPlatform().getLogger();
     }
@@ -314,7 +361,7 @@ public class MappingDataBase implements MappingData {
      */
     protected int checkValidity(final int id, final int mappedId, final String type) {
         if (mappedId == -1) {
-            if (!Via.getConfig().isSuppressConversionWarnings()) {
+            if (Via.getConfig().logOtherConversionWarnings()) {
                 getLogger().warning(String.format("Missing %s %s for %s %s %d", mappedVersion, type, unmappedVersion, type, id));
             }
             return 0;

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -210,7 +210,7 @@ public class MappingDataLoader {
             return null;
         }
 
-        final int mappedSize = tag.getIntTag("mappedSize").asInt();
+        final int mappedSize = tag.getInt("mappedSize", -1);
         final byte strategy = tag.getByteTag("id").asByte();
         final V mappings;
         if (strategy == DIRECT_ID) {

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/entity/ClientEntityIdChangeListener.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/entity/DimensionData.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/entity/EntityTracker.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -82,6 +82,11 @@ public interface EntityTracker {
      */
     void clearEntities();
 
+    /**
+     * Clears all stored data, including entity types, entity data and client entity id.
+     */
+    void clear();
+
     /**
      * Returns the stored entity data if an entity with the id is tracked, else null.
      * If no data has been initialized yet, it will be done and returned by this method.
@@ -123,6 +128,20 @@ public interface EntityTracker {
      */
     void setClientEntityId(int clientEntityId);
 
+    /**
+     * Returns whether the client player has the "insta build" ability, usually from creative mode.
+     *
+     * @return whether the client player can insta build
+     */
+    boolean canInstaBuild();
+
+    /**
+     * Sets whether the client player has the "insta build" ability, usually from creative mode.
+     *
+     * @param instaBuild whether the client player can insta build
+     */
+    void setInstaBuild(boolean instaBuild);
+
     /**
      * Returns the current world section height (block height / 16).
      * This is always 16 for sub 1.17 worlds.
@@ -166,6 +185,20 @@ public interface EntityTracker {
      */
     void setCurrentWorld(String currentWorld);
 
+    /**
+     * Returns the id of the current dimension, or -1 if unset (i.e. before 1.20.5).
+     *
+     * @return id of the current dimension, or -1 if unset
+     */
+    int currentDimensionId();
+
+    /**
+     * Sets the id of the current dimension.
+     *
+     * @param currentDimensionId id of the current dimension
+     */
+    void setCurrentDimensionId(int currentDimensionId);
+
     int biomesSent();
 
     void setBiomesSent(int biomesSent);

api/src/main/java/com/viaversion/viaversion/api/data/entity/StoredEntityData.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/entity/TrackedEntity.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/data/item/ItemHasher.java

@@ -0,0 +1,42 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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.data.item;
+
+/**
+ * Used for converting items to hashed items and caching them for later use during serverbound packets.
+ * <p>
+ * Most of this stays in the internal module given non-permanent, imperfect caching as well as missing converters.
+ */
+public interface ItemHasher {
+
+    /**
+     * Returns whether this connection is currently processing a clientbound player inventory packet.
+     * <p>
+     * Used for checking when it is necessary to track/process item data hashes.
+     *
+     * @return true if processing a clientbound inventory packet, false otherwise
+     */
+    boolean isProcessingClientboundInventoryPacket();
+
+    void setProcessingClientboundInventoryPacket(boolean processingClientboundInventoryPacket);
+}

api/src/main/java/com/viaversion/viaversion/api/debug/DebugHandler.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -52,7 +52,7 @@ public interface DebugHandler {
     void addPacketTypeNameToLog(String packetTypeName);
 
     /**
-     * Adds a packet id to the list of packet types to log.
+     * Adds a packet type to the list of packet types to log.
      * Packets will be checked on each protocol transformer, so this is best used on single protocol pipes.
      *
      * @param packetType packet type
@@ -66,6 +66,13 @@ public interface DebugHandler {
      */
     boolean removePacketTypeNameToLog(String packetTypeName);
 
+    /**
+     * Removes a packet type from the list of packet types to log.
+     *
+     * @param packetType Packet type to remove
+     */
+    boolean removePacketTypeToLog(PacketType packetType);
+
     /**
      * Resets packet type filters.
      */
@@ -121,7 +128,12 @@ public interface DebugHandler {
      */
     boolean shouldLog(PacketWrapper wrapper, Direction direction);
 
-    default void enableAndLogIds(final PacketType... packetTypes) {
+    /**
+     * Enables debug mode and adds the given packet types to the log list.
+     *
+     * @param packetTypes packet types to log
+     */
+    default void enableAndLogTypes(final PacketType... packetTypes) {
         setEnabled(true);
         for (final PacketType packetType : packetTypes) {
             addPacketTypeToLog(packetType);
@@ -135,7 +147,7 @@ public interface DebugHandler {
      * @param t     thrown exception
      */
     default void error(final String error, final Throwable t) {
-        if (!Via.getConfig().isSuppressConversionWarnings() || enabled()) {
+        if (Via.getConfig().logOtherConversionWarnings() || enabled()) {
             Via.getPlatform().getLogger().log(Level.SEVERE, error, t);
         }
     }

api/src/main/java/com/viaversion/viaversion/api/legacy/LegacyViaAPI.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/legacy/bossbar/BossBar.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/legacy/bossbar/BossColor.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/legacy/bossbar/BossFlag.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/legacy/bossbar/BossStyle.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockChangeRecord1_16_2.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -58,7 +58,7 @@ public class BlockChangeRecord1_16_2 implements BlockChangeRecord {
 
     @Override
     public short getY(int chunkSectionY) {
-        Preconditions.checkArgument(chunkSectionY >= 0, "Invalid chunkSectionY: " + chunkSectionY);
+        Preconditions.checkArgument(chunkSectionY >= 0, "Invalid chunkSectionY: %s", chunkSectionY);
         return (short) ((chunkSectionY << 4) + sectionY);
     }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockChangeRecord1_8.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -33,7 +33,6 @@ public enum BlockFace {
     TOP((byte) 0, (byte) 1, (byte) 0, EnumAxis.Y),
     BOTTOM((byte) 0, (byte) -1, (byte) 0, EnumAxis.Y);
 
-    public static final BlockFace[] HORIZONTAL = {NORTH, SOUTH, EAST, WEST};
     private static final Map<BlockFace, BlockFace> opposites = new EnumMap<>(BlockFace.class);
 
     static {

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -24,22 +24,28 @@ package com.viaversion.viaversion.api.minecraft;
 
 public enum GameMode {
 
-    NOT_SET(""),
-    SURVIVAL("Survival Mode"),
-    CREATIVE("Creative Mode"),
-    ADVENTURE("Adventure Mode"),
-    SPECTATOR("Spectator Mode");
+    NOT_SET("", -1),
+    SURVIVAL("Survival Mode", 0),
+    CREATIVE("Creative Mode", 1),
+    ADVENTURE("Adventure Mode", 2),
+    SPECTATOR("Spectator Mode", 3);
 
     private final String text;
+    private final int id;
 
-    GameMode(String text) {
+    GameMode(String text, final int id) {
         this.text = text;
+        this.id = id;
     }
 
     public String text() {
         return text;
     }
 
+    public int id() {
+        return id;
+    }
+
     public static GameMode getById(int id) {
         return switch (id) {
             case -1 -> NOT_SET;

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -22,11 +22,35 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 import java.util.UUID;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public record GameProfile(@Nullable String name, @Nullable UUID id, Property[] properties) {
+public record GameProfile(@Nullable String name, @Nullable UUID id, Property[] properties, boolean dynamic) {
+
+    public GameProfile(@Nullable final String name, @Nullable final UUID id, final Property[] properties) {
+        this(name, id, properties, true);
+    }
+
+    public GameProfile(@Nullable final String name, @Nullable final UUID id) {
+        this(name, id, new Property[0]);
+    }
+
+    public Map<String, List<Property>> propertiesMap() {
+        final Map<String, List<Property>> map = new HashMap<>();
+        for (Property property : properties) {
+            map.computeIfAbsent(property.name(), k -> new ArrayList<>()).add(property);
+        }
+        return map;
+    }
 
     public record Property(String name, String value, @Nullable String signature) {
+
+        public Property(final String name, final String value) {
+            this(name, value, null);
+        }
     }
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -23,6 +23,8 @@
 package com.viaversion.viaversion.api.minecraft;
 
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
 
 public interface Holder<T> {
 
@@ -88,5 +90,24 @@ public interface Holder<T> {
      * @param rewriteFunction the function to rewrite the id
      * @return a new holder with the id rewritten, or self
      */
-    Holder<T> updateId(final Int2IntFunction rewriteFunction);
+    default Holder<T> updateId(final Int2IntFunction rewriteFunction) {
+        return this.updateId(rewriteFunction, null);
+    }
+
+    /**
+     * Returns a new holder with the id rewritten using the given function, or self if this is a direct holder or the id did not change.
+     *
+     * @param rewriteFunction the function to rewrite the id
+     * @param ifMissing       a supplier that provides a new holder if the id is missing (i.e. -1)
+     * @return a new holder with the id rewritten, or self
+     */
+    Holder<T> updateId(Int2IntFunction rewriteFunction, Supplier<Holder<T>> ifMissing);
+
+    /**
+     * Returns a new holder with the value rewritten using the given function, or self if this is an id holder or the value did not change.
+     *
+     * @param rewriteFunction the function to rewrite the value
+     * @return a new holder with the value rewritten, or self
+     */
+    Holder<T> updateValue(final Function<T, T> rewriteFunction);
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -22,7 +22,11 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import java.util.function.Function;
 
 /**
  * Set of ids that either holds a string tag key or an array of ids.
@@ -32,7 +36,7 @@ public interface HolderSet {
     /**
      * Creates a new holder set for the given tag.
      *
-     * @param tagKey the tag key
+     * @param tagKey the tag key, not including '#'
      * @return a new holder set
      */
     static HolderSet of(final String tagKey) {
@@ -49,10 +53,29 @@ public interface HolderSet {
         return new HolderSetImpl.Ids(ids);
     }
 
+    static HolderSet fromTag(final Tag tag, final Function<String, Integer> mappingFunction) {
+        if (tag instanceof StringTag stringTag) {
+            if (stringTag.getValue().startsWith("#")) {
+                return HolderSet.of(stringTag.getValue().substring(1));
+            }
+
+            final int id = mappingFunction.apply(stringTag.getValue());
+            return HolderSet.of(new int[]{id});
+        } else if (tag instanceof ListTag<?> listTag) {
+            final int[] ids = new int[listTag.size()];
+            for (int i = 0; i < listTag.size(); i++) {
+                final String value = ((StringTag) listTag.get(i)).getValue();
+                ids[i] = mappingFunction.apply(value);
+            }
+            return HolderSet.of(ids);
+        }
+        throw new IllegalArgumentException();
+    }
+
     /**
-     * Gets the tag key.
+     * Gets the tag key, not including '#'.
      *
-     * @return the tag key
+     * @return the tag key without a '#'
      * @see #hasTagKey()
      */
     String tagKey();

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -67,11 +67,17 @@ final class HolderSetImpl {
 
         @Override
         public HolderSet rewrite(final Int2IntFunction idRewriter) {
+            // Filter out negative ids as they would come from missing VB mapping data. This happens especially
+            // with block ids which are not mapped and thus written as -1 so VV rewriters can cancel them nicely.
             final int[] mappedIds = new int[ids.length];
-            for (int i = 0; i < mappedIds.length; i++) {
-                mappedIds[i] = idRewriter.applyAsInt(ids[i]);
+            int validCount = 0;
+            for (final int id : ids) {
+                final int mappedId = idRewriter.applyAsInt(id);
+                if (mappedId != -1) {
+                    mappedIds[validCount++] = mappedId;
+                }
             }
-            return new Ids(mappedIds);
+            return new Ids(validCount == ids.length ? mappedIds : Arrays.copyOf(mappedIds, validCount));
         }
 
         @Override

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -24,6 +24,8 @@ package com.viaversion.viaversion.api.minecraft;
 
 import com.google.common.base.Preconditions;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
 
 record IdHolder<T>(int id) implements Holder<T> {
 
@@ -47,14 +49,22 @@ record IdHolder<T>(int id) implements Holder<T> {
     }
 
     @Override
-    public Holder<T> updateId(final Int2IntFunction rewriteFunction) {
+    public Holder<T> updateId(final Int2IntFunction rewriteFunction, final Supplier<Holder<T>> ifMissing) {
         final int rewrittenId = rewriteFunction.applyAsInt(id);
         if (rewrittenId == id) {
             return this;
         }
         if (rewrittenId == -1) {
+            if (ifMissing != null) {
+                return ifMissing.get();
+            }
             throw new IllegalArgumentException("Received invalid id in updateId");
         }
         return Holder.of(rewrittenId);
     }
+
+    @Override
+    public Holder<T> updateValue(final Function<T, T> rewriteFunction) {
+        return this;
+    }
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -23,8 +23,10 @@
 package com.viaversion.viaversion.api.minecraft;
 
 import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.api.minecraft.codec.Ops;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.HolderType;
+import com.viaversion.viaversion.util.Key;
 import io.netty.buffer.ByteBuf;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
@@ -56,8 +58,8 @@ public record PaintingVariant(int width, int height, String assetId, @Nullable T
             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);
+            final Tag title = Types.TRUSTED_OPTIONAL_TAG.read(buffer);
+            final Tag author = Types.TRUSTED_OPTIONAL_TAG.read(buffer);
             return new PaintingVariant(width, height, assetId, title, author);
         }
 
@@ -66,8 +68,24 @@ public record PaintingVariant(int width, int height, String assetId, @Nullable T
             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());
+            Types.TRUSTED_OPTIONAL_TAG.write(buffer, variant.title());
+            Types.TRUSTED_OPTIONAL_TAG.write(buffer, variant.author());
+        }
+
+        @Override
+        public void writeDirect(final Ops ops, final PaintingVariant value) {
+            // Unused, cannot be direct despite having a direct network codec
+            ops.writeMap(map -> map
+                .write("width", Types.INT, value.width())
+                .write("height", Types.INT, value.height())
+                .write("asset_id", Types.IDENTIFIER, Key.of(value.assetId()))
+                .writeOptional("title", Types.TRUSTED_TAG, value.title())
+                .writeOptional("author", Types.TRUSTED_TAG, value.author()));
+        }
+
+        @Override
+        protected Key identifier(final Ops ops, final int id) {
+            return ops.context().registryAccess().registryKey("painting_variant", id);
         }
     };
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -121,7 +121,7 @@ public final class Particle implements IdHolder, Copyable {
 
         @Override
         public ParticleData<T> copy() {
-            return new ParticleData<>(type, copy(value));
+            return new ParticleData<>(type, Copyable.copy(value));
         }
 
         @Override

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -0,0 +1,42 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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;
+
+import com.viaversion.viaversion.api.data.MappingData.MappingType;
+import com.viaversion.viaversion.util.Key;
+
+/**
+ * Holds a key for a registry.
+ * Depending on the context, the key may be used to get registry entries from either synchronized or hardcoded registries.
+ *
+ * @see MappingType
+ * @see #of(String)
+ */
+public interface RegistryKey {
+
+    Key key();
+
+    static RegistryKey of(final String key) {
+        return new SimpleRegistryKey(Key.of(key));
+    }
+}

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -22,25 +22,28 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import com.viaversion.viaversion.util.Key;
 import java.util.HashMap;
 import java.util.Map;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public enum RegistryType {
+public enum RegistryType implements RegistryKey {
 
     BLOCK("block"),
     ITEM("item"),
     FLUID("fluid"),
     ENTITY("entity_type"),
     GAME_EVENT("game_event"),
-    ENCHANTMENT("enchantment");
+    ENCHANTMENT("enchantment"),
+    DAMAGE_TYPE("damage_type"),
+    BANNER_PATTERN("banner_pattern");
 
     private static final Map<String, RegistryType> MAP = new HashMap<>();
     private static final RegistryType[] VALUES = values();
 
     static {
         for (RegistryType type : getValues()) {
-            MAP.put(type.resourceLocation, type);
+            MAP.put(type.identifier, type);
         }
     }
 
@@ -48,17 +51,22 @@ public enum RegistryType {
         return VALUES;
     }
 
-    public static @Nullable RegistryType getByKey(String resourceKey) {
-        return MAP.get(resourceKey);
+    public static @Nullable RegistryType getByKey(String identifier) {
+        return MAP.get(identifier);
     }
 
-    private final String resourceLocation;
+    private final String identifier;
 
-    RegistryType(final String resourceLocation) {
-        this.resourceLocation = resourceLocation;
+    RegistryType(final String identifier) {
+        this.identifier = identifier;
     }
 
-    public String resourceLocation() {
-        return resourceLocation;
+    public String identifier() {
+        return identifier;
+    }
+
+    @Override
+    public Key key() {
+        return Key.of(identifier);
     }
 }

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

@@ -0,0 +1,37 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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;
+
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Profile that can be either dynamically filled by the client or is already static.
+ * The additional fields are optional overrides.
+ */
+public record ResolvableProfile(GameProfile profile, @Nullable String bodyTexture, @Nullable String capeTexture,
+                                @Nullable String elytraTexture, @Nullable Integer modelType) {
+
+    public ResolvableProfile(final GameProfile profile) {
+        this(profile, null, null, null, null);
+    }
+}

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

@@ -0,0 +1,33 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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;
+
+import com.viaversion.viaversion.util.Key;
+
+record SimpleRegistryKey(Key key) implements RegistryKey {
+
+    @Override
+    public String toString() {
+        return key.toString();
+    }
+}

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -22,11 +22,21 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import it.unimi.dsi.fastutil.ints.Int2IntFunction;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public record SoundEvent(String identifier, @Nullable Float fixedRange) {
 
+    private static final Holder<SoundEvent> UNKNOWN = Holder.of(new SoundEvent("viaversion:unknown", 0F));
+
     public SoundEvent withIdentifier(final String identifier) {
         return new SoundEvent(identifier, this.fixedRange);
     }
+
+    public static @Nullable Holder<SoundEvent> rewriteHolder(@Nullable final Holder<SoundEvent> holder, final Int2IntFunction soundRewriteFunction) {
+        if (holder == null) {
+            return null;
+        }
+        return holder.updateId(soundRewriteFunction, () -> UNKNOWN);
+    }
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -23,6 +23,8 @@
 package com.viaversion.viaversion.api.minecraft;
 
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
 
 record ValueHolder<T>(T value) implements Holder<T> {
 
@@ -42,7 +44,13 @@ record ValueHolder<T>(T value) implements Holder<T> {
     }
 
     @Override
-    public Holder<T> updateId(final Int2IntFunction rewriteFunction) {
+    public Holder<T> updateId(final Int2IntFunction rewriteFunction, final Supplier<Holder<T>> ifMissing) {
         return this;
     }
+
+    @Override
+    public Holder<T> updateValue(final Function<T, T> rewriteFunction) {
+        final T rewrittenValue = rewriteFunction.apply(value);
+        return rewrittenValue != value ? Holder.of(rewrittenValue) : this;
+    }
 }

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/Vector3d.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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;
+
+public record Vector3d(double x, double y, double z) {
+
+    public static final Vector3d ZERO = new Vector3d(0, 0, 0);
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/Vector3f.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

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

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/blockentity/BlockEntity.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/blockentity/BlockEntityImpl.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/BaseChunk.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/Chunk.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/Chunk1_18.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/Chunk1_21_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSection.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -61,6 +61,17 @@ public interface ChunkSection {
 
     void setNonAirBlocksCount(int nonAirBlocksCount);
 
+    /**
+     * Returns the number of fluid blocks in this section.
+     * <p>
+     * Available with versions 26.1+.
+     *
+     * @return fluid blocks in this section
+     */
+    int getFluidCount();
+
+    void setFluidCount(int fluidCount);
+
     /**
      * Returns whether this section holds light data.
      * Only true for &lt; 1.14 chunks.

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionImpl.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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
@@ -30,6 +30,7 @@ public class ChunkSectionImpl implements ChunkSection {
     private final EnumMap<PaletteType, DataPalette> palettes = new EnumMap<>(PaletteType.class);
     private ChunkSectionLight light;
     private int nonAirBlocksCount;
+    private int fluidCount;
 
     public ChunkSectionImpl() {
     }
@@ -58,6 +59,16 @@ public class ChunkSectionImpl implements ChunkSection {
         this.nonAirBlocksCount = nonAirBlocksCount;
     }
 
+    @Override
+    public int getFluidCount() {
+        return fluidCount;
+    }
+
+    @Override
+    public void setFluidCount(final int fluidCount) {
+        this.fluidCount = fluidCount;
+    }
+
     @Override
     public @Nullable ChunkSectionLight getLight() {
         return light;

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionLight.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionLightImpl.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2025 ViaVersion and contributors
+ * Copyright (C) 2016-2026 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