1.21.4 (#3021)

* Add the bundled data files

* feat: add 1.21.4 adapter

* Update the XTypes/XCategories files

Co-authored-by: Maddy Miller <mnmiller1@me.com>

* chore/fix: update isFullCube to actually check for shape not occlusion

* chore: remove forget packet

* chore: add block connection fixer to adapter

---------

Co-authored-by: Maddy Miller <mnmiller1@me.com>

build.gradle.kts

@@ -83,7 +83,7 @@ allprojects {
 }
 
 applyCommonConfiguration()
-val supportedVersions = listOf("1.20.4", "1.20.5", "1.20.6", "1.21", "1.21.1", "1.21.3")
+val supportedVersions = listOf("1.20.4", "1.20.5", "1.20.6", "1.21", "1.21.1", "1.21.3", "1.21.4")
 
 tasks {
     supportedVersions.forEach {

settings.gradle.kts

@@ -2,7 +2,7 @@ rootProject.name = "FastAsyncWorldEdit"
 
 include("worldedit-libs")
 
-listOf("1_20_2", "1_20_4", "1_20_5", "1_21", "1_21_3").forEach {
+listOf("1_20_2", "1_20_4", "1_20_5", "1_21", "1_21_3", "1_21_4").forEach {
     include("worldedit-bukkit:adapters:adapter-$it")
 }
 

worldedit-bukkit/adapters/adapter-1_21_4/build.gradle.kts

@@ -0,0 +1,17 @@
+import io.papermc.paperweight.userdev.PaperweightUserDependenciesExtension
+
+plugins {
+    java
+}
+
+applyPaperweightAdapterConfiguration()
+
+repositories {
+    gradlePluginPortal()
+}
+
+dependencies {
+    // url=https://repo.papermc.io/service/rest/repository/browse/maven-public/io/papermc/paper/dev-bundle/1.21.4-R0.1-SNAPSHOT/
+    the<PaperweightUserDependenciesExtension>().paperDevBundle("1.21.4-R0.1-20241207.191616-8")
+    compileOnly(libs.paperlib)
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext/fawe/v1_21_4/PaperweightFakePlayer.java

@@ -0,0 +1,87 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.bukkit.adapter.ext.fawe.v1_21_4;
+
+import com.mojang.authlib.GameProfile;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ClientInformation;
+import net.minecraft.server.level.ParticleStatus;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.stats.Stat;
+import net.minecraft.world.MenuProvider;
+import net.minecraft.world.damagesource.DamageSource;
+import net.minecraft.world.entity.HumanoidArm;
+import net.minecraft.world.entity.player.ChatVisiblity;
+import net.minecraft.world.level.block.entity.SignBlockEntity;
+import net.minecraft.world.phys.Vec3;
+
+import java.util.OptionalInt;
+import java.util.UUID;
+
+class PaperweightFakePlayer extends ServerPlayer {
+    private static final GameProfile FAKE_WORLDEDIT_PROFILE = new GameProfile(UUID.nameUUIDFromBytes("worldedit".getBytes()), "[WorldEdit]");
+    private static final Vec3 ORIGIN = new Vec3(0.0D, 0.0D, 0.0D);
+    private static final ClientInformation FAKE_CLIENT_INFO = new ClientInformation(
+        "en_US", 16, ChatVisiblity.FULL, true, 0, HumanoidArm.LEFT, false, false, ParticleStatus.ALL
+    );
+
+    PaperweightFakePlayer(ServerLevel world) {
+        super(world.getServer(), world, FAKE_WORLDEDIT_PROFILE, FAKE_CLIENT_INFO);
+    }
+
+    @Override
+    public Vec3 position() {
+        return ORIGIN;
+    }
+
+    @Override
+    public void tick() {
+    }
+
+    @Override
+    public void die(DamageSource damagesource) {
+    }
+
+    @Override
+    public OptionalInt openMenu(MenuProvider factory) {
+        return OptionalInt.empty();
+    }
+
+    @Override
+    public void updateOptions(ClientInformation clientOptions) {
+    }
+
+    @Override
+    public void displayClientMessage(Component message, boolean actionBar) {
+    }
+
+    @Override
+    public void awardStat(Stat<?> stat, int amount) {
+    }
+
+    @Override
+    public void awardStat(Stat<?> stat) {
+    }
+
+    @Override
+    public void openTextEdit(SignBlockEntity sign, boolean front) {
+    }
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext/fawe/v1_21_4/PaperweightServerLevelDelegateProxy.java

@@ -0,0 +1,240 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.bukkit.adapter.ext.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.internal.exception.FaweException;
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.MaxChangedBlocksException;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import com.sk89q.worldedit.bukkit.adapter.Refraction;
+import com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4.PaperweightFaweAdapter;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.internal.util.LogManagerCompat;
+import com.sk89q.worldedit.world.block.BlockTypes;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.tags.FluidTags;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.level.WorldGenLevel;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.material.FluidState;
+import net.minecraft.world.phys.AABB;
+import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class PaperweightServerLevelDelegateProxy implements InvocationHandler {
+
+    private static final Logger LOGGER = LogManagerCompat.getLogger();
+
+    // FAWE start - extent not EditSession
+    private final Extent editSession;
+    //FAWE end
+    private final ServerLevel serverLevel;
+    //FAWE start - use FAWE adapter
+    private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
+            .getInstance()
+            .getBukkitImplAdapter());
+    //FAWE end
+    //FAWE start - force error if method not caught by this instance
+    private final boolean errorOnPassthrough;
+    //FAWE end
+
+    private PaperweightServerLevelDelegateProxy(EditSession editSession, ServerLevel serverLevel, PaperweightAdapter adapter) {
+        this.editSession = editSession;
+        this.serverLevel = serverLevel;
+        //FAWE start
+        this.errorOnPassthrough = false;
+        //FAWE end
+    }
+
+    public static WorldGenLevel newInstance(EditSession editSession, ServerLevel serverLevel, PaperweightAdapter adapter) {
+        return (WorldGenLevel) Proxy.newProxyInstance(
+                serverLevel.getClass().getClassLoader(),
+                serverLevel.getClass().getInterfaces(),
+                new PaperweightServerLevelDelegateProxy(editSession, serverLevel, adapter)
+        );
+    }
+
+    //FAWE start - force error if method not caught by this instance
+    private PaperweightServerLevelDelegateProxy(Extent extent, ServerLevel serverLevel, boolean errorOnPassthrough) {
+        this.editSession = extent;
+        this.serverLevel = serverLevel;
+        this.errorOnPassthrough = errorOnPassthrough;
+    }
+
+    public static WorldGenLevel newInstance(Extent extent, ServerLevel serverLevel, boolean errorOnPassthrough) {
+        return (WorldGenLevel) Proxy.newProxyInstance(
+                serverLevel.getClass().getClassLoader(),
+                serverLevel.getClass().getInterfaces(),
+                new PaperweightServerLevelDelegateProxy(extent, serverLevel, errorOnPassthrough)
+        );
+    }
+    //FAWE end
+
+    @Nullable
+    private BlockEntity getBlockEntity(BlockPos blockPos) {
+        BlockEntity tileEntity = this.serverLevel.getChunkAt(blockPos).getBlockEntity(blockPos);
+        if (tileEntity == null) {
+            return null;
+        }
+        BlockEntity newEntity = tileEntity.getType().create(blockPos, getBlockState(blockPos));
+        newEntity.loadWithComponents(
+                (CompoundTag) adapter.fromNativeLin(this.editSession.getFullBlock(
+                        blockPos.getX(),
+                        blockPos.getY(),
+                        blockPos.getZ()
+                ).getNbtReference().getValue()),
+                this.serverLevel.registryAccess()
+        );
+
+        return newEntity;
+    }
+
+    private BlockState getBlockState(BlockPos blockPos) {
+        return adapter.adapt(this.editSession.getBlock(blockPos.getX(), blockPos.getY(), blockPos.getZ()));
+    }
+
+    private boolean setBlock(BlockPos blockPos, BlockState blockState) {
+        try {
+            return editSession.setBlock(blockPos.getX(), blockPos.getY(), blockPos.getZ(), adapter.adapt(blockState));
+        } catch (MaxChangedBlocksException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private boolean removeBlock(BlockPos blockPos, boolean bl) {
+        try {
+            return editSession.setBlock(blockPos.getX(), blockPos.getY(), blockPos.getZ(), BlockTypes.AIR.getDefaultState());
+        } catch (MaxChangedBlocksException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private FluidState getFluidState(BlockPos pos) {
+        return getBlockState(pos).getFluidState();
+    }
+
+    private boolean isWaterAt(BlockPos pos) {
+        return getBlockState(pos).getFluidState().is(FluidTags.WATER);
+    }
+
+    @Override
+    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+        //FAWE start - cannot use switch where method names are equal
+        String methodName = method.getName();
+        if (Refraction.pickName("getBlockState", "a_").equals(methodName)) {
+            if (args.length == 1 && args[0] instanceof BlockPos blockPos) {
+                // getBlockState
+                return getBlockState(blockPos);
+            }
+        }
+        if (Refraction.pickName("getBlockEntity", "c_").equals(methodName)) {
+            if (args.length == 1 && args[0] instanceof BlockPos blockPos) {
+                // getBlockEntity
+                return getBlockEntity(blockPos);
+            }
+        }
+        if ("a".equals(methodName) || "setBlock".equals(methodName) || "removeBlock".equals(methodName) || "destroyBlock".equals(
+                methodName)) {
+            if (args.length >= 2 && args[0] instanceof BlockPos blockPos && args[1] instanceof BlockState blockState) {
+                // setBlock
+                return setBlock(blockPos, blockState);
+            } else if (args.length >= 2 && args[0] instanceof BlockPos blockPos && args[1] instanceof Boolean bl) {
+                // removeBlock (and also matches destroyBlock)
+                return removeBlock(blockPos, bl);
+            }
+        }
+        //FAWE start
+        if (Refraction.pickName("getFluidState", "b_").equals(methodName)) { //net.minecraft.world.level.BlockGetter
+            if (args.length == 1 && args[0] instanceof BlockPos blockPos) {
+                return getFluidState(blockPos);
+            }
+        }
+        if (Refraction.pickName("isWaterAt", "z").equals(methodName)) { //net.minecraft.world.level.LevelReader
+            if (args.length == 1 && args[0] instanceof BlockPos blockPos) {
+                return isWaterAt(blockPos);
+            }
+        }
+        if (Refraction.pickName("getEntities", "a_").equals(methodName)) { //net.minecraft.world.level.EntityGetter
+            if (args.length == 2 && args[0] instanceof Entity && args[1] instanceof AABB) {
+                return new ArrayList<>();
+            }
+        }
+        // Specific passthroughs that we want to allow
+        // net.minecraft.world.level.BlockAndTintGetter
+        if (Refraction.pickName("getRawBrightness", "b").equals(methodName)) {
+            return method.invoke(this.serverLevel, args);
+        }
+        // net.minecraft.world.level.LevelHeightAccessor
+        if (Refraction.pickName("getMaxBuildHeight", "al").equals(methodName)) {
+            if (args.length == 0) {
+                return method.invoke(this.serverLevel, args);
+            }
+        }
+        // net.minecraft.world.level.SignalGetter
+        if (Refraction.pickName("hasNeighborSignal", "C").equals(methodName)) {
+            if (args.length == 1 && args[0] instanceof BlockPos) {
+                return method.invoke(this.serverLevel, args);
+            }
+        }
+        if (Refraction.pickName("getSignal", "c").equals(methodName)) {
+            if (args.length == 2 && args[0] instanceof BlockPos && args[1] instanceof Direction) {
+                return method.invoke(this.serverLevel, args);
+            }
+        }
+        if (Refraction.pickName("getControlInputSignal", "a").equals(methodName)) {
+            if (args.length == 3 && args[0] instanceof BlockPos && args[1] instanceof Direction && args[2] instanceof Boolean) {
+                return method.invoke(this.serverLevel, args);
+            }
+        }
+        if (Refraction.pickName("getDirectSignal", "a").equals(methodName)) {
+            if (args.length == 2 && args[0] instanceof BlockPos && args[1] instanceof Direction) {
+                return method.invoke(this.serverLevel, args);
+            }
+        }
+        //FAWE start - force error if method not caught by this instance
+        if (errorOnPassthrough) {
+            LOGGER.error(
+                    """
+                            Attempted passthough of method {}.
+                            Method argument types: {}
+                            Method argument values: {}
+                            """,
+                    method.getName(),
+                    Arrays.stream(args).map(a -> a.getClass().getName()).toList(),
+                    Arrays.stream(args).map(Object::toString).toList()
+            );
+            throw new FaweException("Method required passthrough.");
+        }
+        //FAWE end
+
+        return method.invoke(this.serverLevel, args);
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext/fawe/v1_21_4/PaperweightWorldNativeAccess.java

@@ -0,0 +1,192 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.bukkit.adapter.ext.fawe.v1_21_4;
+
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.internal.block.BlockStateIdAccess;
+import com.sk89q.worldedit.internal.wna.WorldNativeAccess;
+import com.sk89q.worldedit.util.SideEffect;
+import com.sk89q.worldedit.util.SideEffectSet;
+import com.sk89q.worldedit.world.block.BlockState;
+import net.minecraft.core.BlockPos;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.level.FullChunkStatus;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.redstone.ExperimentalRedstoneUtils;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockPhysicsEvent;
+import org.enginehub.linbus.tree.LinCompoundTag;
+
+import javax.annotation.Nullable;
+import java.lang.ref.WeakReference;
+import java.util.Objects;
+
+public class PaperweightWorldNativeAccess implements WorldNativeAccess<LevelChunk, net.minecraft.world.level.block.state.BlockState, BlockPos> {
+    private static final int UPDATE = 1;
+    private static final int NOTIFY = 2;
+
+    private final PaperweightAdapter adapter;
+    private final WeakReference<ServerLevel> world;
+    private SideEffectSet sideEffectSet;
+
+    public PaperweightWorldNativeAccess(PaperweightAdapter adapter, WeakReference<ServerLevel> world) {
+        this.adapter = adapter;
+        this.world = world;
+    }
+
+    private ServerLevel getWorld() {
+        return Objects.requireNonNull(world.get(), "The reference to the world was lost");
+    }
+
+    @Override
+    public void setCurrentSideEffectSet(SideEffectSet sideEffectSet) {
+        this.sideEffectSet = sideEffectSet;
+    }
+
+    @Override
+    public LevelChunk getChunk(int x, int z) {
+        return getWorld().getChunk(x, z);
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState toNative(BlockState state) {
+        int stateId = BlockStateIdAccess.getBlockStateId(state);
+        return BlockStateIdAccess.isValidInternalId(stateId)
+            ? Block.stateById(stateId)
+            : ((CraftBlockData) BukkitAdapter.adapt(state)).getState();
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState getBlockState(LevelChunk chunk, BlockPos position) {
+        return chunk.getBlockState(position);
+    }
+
+    @Nullable
+    @Override
+    public net.minecraft.world.level.block.state.BlockState setBlockState(LevelChunk chunk, BlockPos position, net.minecraft.world.level.block.state.BlockState state) {
+        return chunk.setBlockState(position, state, false, this.sideEffectSet.shouldApply(SideEffect.UPDATE));
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState getValidBlockForPosition(net.minecraft.world.level.block.state.BlockState block, BlockPos position) {
+        return Block.updateFromNeighbourShapes(block, getWorld(), position);
+    }
+
+    @Override
+    public BlockPos getPosition(int x, int y, int z) {
+        return new BlockPos(x, y, z);
+    }
+
+    @Override
+    public void updateLightingForBlock(BlockPos position) {
+        getWorld().getChunkSource().getLightEngine().checkBlock(position);
+    }
+
+    @Override
+    public boolean updateTileEntity(BlockPos position, LinCompoundTag tag) {
+        // We will assume that the tile entity was created for us
+        BlockEntity tileEntity = getWorld().getBlockEntity(position);
+        if (tileEntity == null) {
+            return false;
+        }
+        Tag nativeTag = adapter.fromNativeLin(tag);
+        PaperweightAdapter.readTagIntoTileEntity((net.minecraft.nbt.CompoundTag) nativeTag, tileEntity);
+        return true;
+    }
+
+    @Override
+    public void notifyBlockUpdate(LevelChunk chunk, BlockPos position, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState) {
+        if (chunk.getSections()[getWorld().getSectionIndex(position.getY())] != null) {
+            getWorld().sendBlockUpdated(position, oldState, newState, UPDATE | NOTIFY);
+        }
+    }
+
+    @Override
+    public boolean isChunkTicking(LevelChunk chunk) {
+        return chunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING);
+    }
+
+    @Override
+    public void markBlockChanged(LevelChunk chunk, BlockPos position) {
+        if (chunk.getSections()[getWorld().getSectionIndex(position.getY())] != null) {
+            getWorld().getChunkSource().blockChanged(position);
+        }
+    }
+
+    @Override
+    public void notifyNeighbors(BlockPos pos, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState) {
+        ServerLevel world = getWorld();
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            world.updateNeighborsAt(pos, oldState.getBlock());
+        } else {
+            // When we don't want events, manually run the physics without them.
+            Block block = oldState.getBlock();
+            fireNeighborChanged(pos, world, block, pos.west());
+            fireNeighborChanged(pos, world, block, pos.east());
+            fireNeighborChanged(pos, world, block, pos.below());
+            fireNeighborChanged(pos, world, block, pos.above());
+            fireNeighborChanged(pos, world, block, pos.north());
+            fireNeighborChanged(pos, world, block, pos.south());
+        }
+        if (newState.hasAnalogOutputSignal()) {
+            world.updateNeighbourForOutputSignal(pos, newState.getBlock());
+        }
+    }
+
+    @Override
+    public void updateBlock(BlockPos pos, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState) {
+        ServerLevel world = getWorld();
+        newState.onPlace(world, pos, oldState, false);
+    }
+
+    private void fireNeighborChanged(BlockPos pos, ServerLevel world, Block block, BlockPos neighborPos) {
+        world.getBlockState(neighborPos).handleNeighborChanged(world, neighborPos, block, ExperimentalRedstoneUtils.initialOrientation(world, null, null), false);
+    }
+
+    @Override
+    public void updateNeighbors(BlockPos pos, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState, int recursionLimit) {
+        ServerLevel world = getWorld();
+        oldState.updateIndirectNeighbourShapes(world, pos, NOTIFY, recursionLimit);
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            CraftWorld craftWorld = world.getWorld();
+            BlockPhysicsEvent event = new BlockPhysicsEvent(craftWorld.getBlockAt(pos.getX(), pos.getY(), pos.getZ()), CraftBlockData.fromData(newState));
+            world.getCraftServer().getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                return;
+            }
+        }
+        newState.updateNeighbourShapes(world, pos, NOTIFY, recursionLimit);
+        newState.updateIndirectNeighbourShapes(world, pos, NOTIFY, recursionLimit);
+    }
+
+    @Override
+    public void onBlockStateChange(BlockPos pos, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState) {
+        getWorld().onBlockStateChange(pos, oldState, newState);
+    }
+
+    @Override
+    public void flush() {
+
+    }
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext/fawe/v1_21_4/StaticRefraction.java

@@ -0,0 +1,84 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.bukkit.adapter.ext.fawe.v1_21_4;
+
+import com.sk89q.worldedit.bukkit.adapter.Refraction;
+
+/**
+ * Dedicated class to map all names that we use.
+ *
+ * <p>
+ * Overloads are split into multiple fields, as they <em>CAN</em> have different obfuscated names.
+ * </p>
+ */
+public final class StaticRefraction {
+    public static final String GET_CHUNK_FUTURE_MAIN_THREAD = Refraction.pickName(
+        "getChunkFutureMainThread", "c"
+    );
+    public static final String MAIN_THREAD_PROCESSOR = Refraction.pickName(
+        "mainThreadProcessor", "g"
+    );
+    public static final String NEXT_TICK_TIME = Refraction.pickName("nextTickTime", "e");
+    public static final String GET_BLOCK_STATE = Refraction.pickName("getBlockState", "a_");
+    /**
+     * {@code addFreshEntityWithPassengers(Entity entity)}.
+     */
+    public static final String ADD_FRESH_ENTITY_WITH_PASSENGERS_ENTITY = Refraction.pickName(
+        "addFreshEntityWithPassengers", "a_"
+    );
+    /**
+     * {@code addFreshEntityWithPassengers(Entity entity, CreatureSpawnEvent.SpawnReason reason)}.
+     */
+    public static final String ADD_FRESH_ENTITY_WITH_PASSENGERS_ENTITY_SPAWN_REASON =
+        Refraction.pickName("addFreshEntityWithPassengers", "a_");
+    /**
+     * {@code addFreshEntity(Entity entity)}.
+     */
+    public static final String ADD_FRESH_ENTITY = Refraction.pickName("addFreshEntity", "b");
+    /**
+     * {@code getBlockEntity(BlockPos blockPos)}.
+     */
+    public static final String GET_BLOCK_ENTITY = Refraction.pickName("getBlockEntity", "c_");
+    /**
+     * {@code setBlock(BlockPos blockPos, BlockState blockState, int flags)}.
+     */
+    public static final String SET_BLOCK = Refraction.pickName("setBlock", "a");
+    /**
+     * {@code setBlock(BlockPos blockPos, BlockState blockState, int flags, int maxUpdateDepth)}.
+     */
+    public static final String SET_BLOCK_MAX_UPDATE = Refraction.pickName("setBlock", "a");
+    public static final String REMOVE_BLOCK = Refraction.pickName("removeBlock", "a");
+    /**
+     * {@code destroyBlock(BlockPos blockPos, boolean drop)}.
+     */
+    public static final String DESTROY_BLOCK = Refraction.pickName("destroyBlock", "b");
+    /**
+     * {@code destroyBlock(BlockPos blockPos, boolean drop, Entity breakingEntity)}.
+     */
+    public static final String DESTROY_BLOCK_BREAKING_ENTITY = Refraction.pickName(
+        "destroyBlock", "a"
+    );
+    /**
+     * {@code destroyBlock(BlockPos blockPos, boolean drop, Entity breakingEntity, int maxUpdateDepth)}.
+     */
+    public static final String DESTROY_BLOCK_BREAKING_ENTITY_MAX_UPDATE = Refraction.pickName(
+        "destroyBlock", "a"
+    );
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightBlockMaterial.java

@@ -0,0 +1,175 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.nbt.FaweCompoundTag;
+import com.sk89q.worldedit.world.registry.BlockMaterial;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.EmptyBlockGetter;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.material.Fluids;
+import net.minecraft.world.level.material.PushReaction;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+
+import javax.annotation.Nullable;
+
+public class PaperweightBlockMaterial implements BlockMaterial {
+
+    private final Block block;
+    private final BlockState blockState;
+    private final CraftBlockData craftBlockData;
+    private final org.bukkit.Material craftMaterial;
+    private final int opacity;
+    private final FaweCompoundTag tile;
+
+    public PaperweightBlockMaterial(Block block) {
+        this(block, block.defaultBlockState());
+    }
+
+    public PaperweightBlockMaterial(Block block, BlockState blockState) {
+        this.block = block;
+        this.blockState = blockState;
+        this.craftBlockData = CraftBlockData.fromData(blockState);
+        this.craftMaterial = craftBlockData.getMaterial();
+        opacity = blockState.getLightBlock();
+        BlockEntity tileEntity = !(block instanceof EntityBlock) ? null : ((EntityBlock) block).newBlockEntity(
+                BlockPos.ZERO,
+                blockState
+        );
+        tile = tileEntity == null
+                ? null
+                : PaperweightGetBlocks.NMS_TO_TILE.apply(tileEntity);
+    }
+
+    public Block getBlock() {
+        return block;
+    }
+
+    public BlockState getState() {
+        return blockState;
+    }
+
+    public CraftBlockData getCraftBlockData() {
+        return craftBlockData;
+    }
+
+    @Override
+    public boolean isAir() {
+        return blockState.isAir();
+    }
+
+    @Override
+    public boolean isFullCube() {
+        return Block.isShapeFullBlock(blockState.getShape(EmptyBlockGetter.INSTANCE, BlockPos.ZERO));
+    }
+
+    @Override
+    public boolean isOpaque() {
+        return blockState.canOcclude();
+    }
+
+    @Override
+    public boolean isPowerSource() {
+        return blockState.isSignalSource();
+    }
+
+    @Override
+    public boolean isLiquid() {
+        return !blockState.getFluidState().is(Fluids.EMPTY);
+    }
+
+    @Override
+    public boolean isSolid() {
+        return blockState.isSolidRender();
+    }
+
+    @Override
+    public float getHardness() {
+        return craftBlockData.getState().destroySpeed;
+    }
+
+    @Override
+    public float getResistance() {
+        return block.getExplosionResistance();
+    }
+
+    @Override
+    public float getSlipperiness() {
+        return block.getFriction();
+    }
+
+    @Override
+    public int getLightValue() {
+        return blockState.getLightEmission();
+    }
+
+    @Override
+    public int getLightOpacity() {
+        return opacity;
+    }
+
+    @Override
+    public boolean isFragileWhenPushed() {
+        return blockState.getPistonPushReaction() == PushReaction.DESTROY;
+    }
+
+    @Override
+    public boolean isUnpushable() {
+        return blockState.getPistonPushReaction() == PushReaction.BLOCK;
+    }
+
+    @Override
+    public boolean isTicksRandomly() {
+        return blockState.isRandomlyTicking();
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    public boolean isMovementBlocker() {
+        return blockState.blocksMotion();
+    }
+
+    @Override
+    public boolean isBurnable() {
+        return craftMaterial.isBurnable();
+    }
+
+    @Override
+    public boolean isToolRequired() {
+        // Removed in 1.16.1, this is not present in higher versions
+        return false;
+    }
+
+    @Override
+    public boolean isReplacedDuringPlacement() {
+        return blockState.canBeReplaced();
+    }
+
+    @Override
+    public boolean isTranslucent() {
+        return !blockState.canOcclude();
+    }
+
+    @Override
+    public boolean hasContainer() {
+        return block instanceof EntityBlock;
+    }
+
+    @Override
+    public boolean isTile() {
+        return block instanceof EntityBlock;
+    }
+
+    @Override
+    public @Nullable FaweCompoundTag defaultTile() {
+        return tile;
+    }
+
+    @Override
+    public int getMapColor() {
+        // rgb field
+        return block.defaultMapColor().col;
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightFaweAdapter.java

@@ -0,0 +1,638 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.bukkit.adapter.FaweAdapter;
+import com.fastasyncworldedit.bukkit.adapter.NMSRelighterFactory;
+import com.fastasyncworldedit.core.FaweCache;
+import com.fastasyncworldedit.core.entity.LazyBaseEntity;
+import com.fastasyncworldedit.core.extent.processor.PlacementStateProcessor;
+import com.fastasyncworldedit.core.extent.processor.lighting.RelighterFactory;
+import com.fastasyncworldedit.core.nbt.FaweCompoundTag;
+import com.fastasyncworldedit.core.queue.IBatchProcessor;
+import com.fastasyncworldedit.core.queue.IChunkGet;
+import com.fastasyncworldedit.core.queue.implementation.packet.ChunkPacket;
+import com.fastasyncworldedit.core.util.NbtUtils;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Sets;
+import com.mojang.serialization.Codec;
+import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.blocks.BaseItemStack;
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.bukkit.adapter.BukkitImplAdapter;
+import com.sk89q.worldedit.bukkit.adapter.ext.fawe.v1_21_4.PaperweightAdapter;
+import com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4.regen.PaperweightRegen;
+import com.sk89q.worldedit.entity.BaseEntity;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.function.mask.BlockTypeMask;
+import com.sk89q.worldedit.internal.block.BlockStateIdAccess;
+import com.sk89q.worldedit.internal.util.LogManagerCompat;
+import com.sk89q.worldedit.internal.wna.WorldNativeAccess;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.regions.Region;
+import com.sk89q.worldedit.registry.state.BooleanProperty;
+import com.sk89q.worldedit.registry.state.DirectionalProperty;
+import com.sk89q.worldedit.registry.state.EnumProperty;
+import com.sk89q.worldedit.registry.state.IntegerProperty;
+import com.sk89q.worldedit.registry.state.Property;
+import com.sk89q.worldedit.util.Direction;
+import com.sk89q.worldedit.util.SideEffect;
+import com.sk89q.worldedit.util.SideEffectSet;
+import com.sk89q.worldedit.util.concurrency.LazyReference;
+import com.sk89q.worldedit.util.formatting.text.Component;
+import com.sk89q.worldedit.world.RegenOptions;
+import com.sk89q.worldedit.world.biome.BiomeType;
+import com.sk89q.worldedit.world.block.BaseBlock;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockStateHolder;
+import com.sk89q.worldedit.world.block.BlockType;
+import com.sk89q.worldedit.world.block.BlockTypesCache;
+import com.sk89q.worldedit.world.entity.EntityType;
+import com.sk89q.worldedit.world.item.ItemType;
+import com.sk89q.worldedit.world.registry.BlockMaterial;
+import io.papermc.lib.PaperLib;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Registry;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.core.WritableRegistry;
+import net.minecraft.core.component.DataComponentPatch;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtOps;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.level.ChunkHolder;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.util.StringRepresentable;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.chunk.LevelChunk;
+import org.apache.logging.log4j.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.NamespacedKey;
+import org.bukkit.World;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+import org.bukkit.entity.Player;
+import org.enginehub.linbus.tree.LinCompoundTag;
+import org.enginehub.linbus.tree.LinStringTag;
+import org.enginehub.linbus.tree.LinTag;
+
+import java.lang.ref.WeakReference;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.OptionalInt;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static net.minecraft.core.registries.Registries.BIOME;
+
+public final class PaperweightFaweAdapter extends FaweAdapter<net.minecraft.nbt.Tag, ServerLevel> {
+
+    private static final Logger LOGGER = LogManagerCompat.getLogger();
+    private static Method CHUNK_HOLDER_WAS_ACCESSIBLE_SINCE_LAST_SAVE;
+    private static final Codec<DataComponentPatch> COMPONENTS_CODEC = DataComponentPatch.CODEC.optionalFieldOf(
+            "components", DataComponentPatch.EMPTY
+    ).codec();
+
+    static {
+        try {
+            CHUNK_HOLDER_WAS_ACCESSIBLE_SINCE_LAST_SAVE = ChunkHolder.class.getDeclaredMethod("wasAccessibleSinceLastSave");
+        } catch (NoSuchMethodException ignored) { // may not be present in newer paper versions
+        }
+    }
+
+    private final PaperweightMapChunkUtil mapUtil = new PaperweightMapChunkUtil();
+
+    public PaperweightFaweAdapter() throws NoSuchFieldException, NoSuchMethodException {
+        super(new PaperweightAdapter());
+    }
+
+    public Function<BlockEntity, FaweCompoundTag> blockEntityToCompoundTag() {
+        return blockEntity -> FaweCompoundTag.of(
+                () -> (LinCompoundTag) toNativeLin(blockEntity.saveWithId(DedicatedServer.getServer().registryAccess()))
+        );
+    }
+
+    public static Property<?> adaptProperty(net.minecraft.world.level.block.state.properties.Property<?> property) {
+        return switch (property) {
+            case net.minecraft.world.level.block.state.properties.BooleanProperty booleanProperty ->
+                    new BooleanProperty(booleanProperty.getName(), ImmutableList.copyOf(booleanProperty.getPossibleValues()));
+            case net.minecraft.world.level.block.state.properties.IntegerProperty integerProperty ->
+                    new IntegerProperty(integerProperty.getName(), ImmutableList.copyOf(integerProperty.getPossibleValues()));
+            case net.minecraft.world.level.block.state.properties.EnumProperty<?> enumProperty -> {
+                if (enumProperty.getValueClass() == net.minecraft.core.Direction.class) {
+                    yield new DirectionalProperty(enumProperty.getName(), enumProperty.getPossibleValues().stream()
+                            .map(StringRepresentable::getSerializedName)
+                            .map(s -> s.toUpperCase(Locale.ROOT))
+                            .map(Direction::valueOf)
+                            .toList()
+                    );
+                }
+                yield new EnumProperty(enumProperty.getName(), enumProperty.getPossibleValues().stream()
+                        .map(StringRepresentable::getSerializedName).collect(Collectors.toCollection(ArrayList::new)));
+            }
+            default -> throw new IllegalArgumentException("FastAsyncWorldEdit needs an update to support " + property.getClass().getSimpleName());
+        };
+    }
+
+    private static String getEntityId(Entity entity) {
+        return net.minecraft.world.entity.EntityType.getKey(entity.getType()).toString();
+    }
+
+    private static void readEntityIntoTag(Entity entity, net.minecraft.nbt.CompoundTag compoundTag) {
+        entity.save(compoundTag);
+    }
+
+    @Override
+    public BukkitImplAdapter<net.minecraft.nbt.Tag> getParent() {
+        return parent;
+    }
+
+    private synchronized boolean init() {
+        if (ibdToStateOrdinal != null && ibdToStateOrdinal[1] != 0) {
+            return false;
+        }
+        ibdToStateOrdinal = new char[BlockTypesCache.states.length]; // size
+        ordinalToIbdID = new int[ibdToStateOrdinal.length]; // size
+        for (int i = 0; i < ibdToStateOrdinal.length; i++) {
+            BlockState blockState = BlockTypesCache.states[i];
+            PaperweightBlockMaterial material = (PaperweightBlockMaterial) blockState.getMaterial();
+            int id = Block.BLOCK_STATE_REGISTRY.getId(material.getState());
+            char ordinal = blockState.getOrdinalChar();
+            ibdToStateOrdinal[id] = ordinal;
+            ordinalToIbdID[ordinal] = id;
+        }
+        Map<String, List<Property<?>>> properties = new HashMap<>();
+        try {
+            for (Field field : BlockStateProperties.class.getDeclaredFields()) {
+                Object obj = field.get(null);
+                if (!(obj instanceof net.minecraft.world.level.block.state.properties.Property<?> state)) {
+                    continue;
+                }
+                Property<?> property = adaptProperty(state);
+                properties.compute(property.getName().toLowerCase(Locale.ROOT), (k, v) -> {
+                    if (v == null) {
+                        v = new ArrayList<>(Collections.singletonList(property));
+                    } else {
+                        v.add(property);
+                    }
+                    return v;
+                });
+            }
+        } catch (IllegalAccessException e) {
+            LOGGER.error("failed to initialize block states", e);
+        } finally {
+            allBlockProperties = ImmutableMap.copyOf(properties);
+        }
+        initialised = true;
+        return true;
+    }
+
+    @Override
+    public BlockMaterial getMaterial(BlockType blockType) {
+        Block block = getBlock(blockType);
+        return new PaperweightBlockMaterial(block);
+    }
+
+    @Override
+    public synchronized BlockMaterial getMaterial(BlockState state) {
+        net.minecraft.world.level.block.state.BlockState blockState = ((CraftBlockData) Bukkit.createBlockData(state.getAsString())).getState();
+        return new PaperweightBlockMaterial(blockState.getBlock(), blockState);
+    }
+
+    public Block getBlock(BlockType blockType) {
+        return DedicatedServer.getServer().registryAccess().lookupOrThrow(Registries.BLOCK)
+                .getValue(ResourceLocation.fromNamespaceAndPath(blockType.getNamespace(), blockType.getResource()));
+    }
+
+    @Deprecated
+    @Override
+    public BlockState getBlock(Location location) {
+        Preconditions.checkNotNull(location);
+
+        int x = location.getBlockX();
+        int y = location.getBlockY();
+        int z = location.getBlockZ();
+        final ServerLevel handle = getServerLevel(location.getWorld());
+        LevelChunk chunk = handle.getChunk(x >> 4, z >> 4);
+        final BlockPos blockPos = new BlockPos(x, y, z);
+        final net.minecraft.world.level.block.state.BlockState blockData = chunk.getBlockState(blockPos);
+        BlockState state = adapt(blockData);
+        if (state == null) {
+            org.bukkit.block.Block bukkitBlock = location.getBlock();
+            state = BukkitAdapter.adapt(bukkitBlock.getBlockData());
+        }
+        return state;
+    }
+
+    @Override
+    public BaseBlock getFullBlock(final Location location) {
+        Preconditions.checkNotNull(location);
+
+        int x = location.getBlockX();
+        int y = location.getBlockY();
+        int z = location.getBlockZ();
+
+        final ServerLevel handle = getServerLevel(location.getWorld());
+        LevelChunk chunk = handle.getChunk(x >> 4, z >> 4);
+        final BlockPos blockPos = new BlockPos(x, y, z);
+        final net.minecraft.world.level.block.state.BlockState blockData = chunk.getBlockState(blockPos);
+        BlockState state = adapt(blockData);
+        if (state == null) {
+            org.bukkit.block.Block bukkitBlock = location.getBlock();
+            state = BukkitAdapter.adapt(bukkitBlock.getBlockData());
+        }
+        if (state.getBlockType().getMaterial().hasContainer()) {
+
+            // Read the NBT data
+            BlockEntity blockEntity = chunk.getBlockEntity(blockPos, LevelChunk.EntityCreationType.CHECK);
+            if (blockEntity != null) {
+                net.minecraft.nbt.CompoundTag tag = blockEntity.saveWithId(DedicatedServer.getServer().registryAccess());
+                return state.toBaseBlock((LinCompoundTag) toNativeLin(tag));
+            }
+        }
+
+        return state.toBaseBlock();
+    }
+
+    private static final Set<SideEffect> SUPPORTED_SIDE_EFFECTS = Sets.immutableEnumSet(
+            SideEffect.HISTORY,
+            SideEffect.HEIGHTMAPS,
+            SideEffect.LIGHTING,
+            SideEffect.NEIGHBORS
+    );
+
+    @Override
+    public Set<SideEffect> getSupportedSideEffects() {
+        return SUPPORTED_SIDE_EFFECTS;
+    }
+
+    @Override
+    public WorldNativeAccess<?, ?, ?> createWorldNativeAccess(org.bukkit.World world) {
+        return new PaperweightFaweWorldNativeAccess(this, new WeakReference<>(getServerLevel(world)));
+    }
+
+    @Override
+    public BaseEntity getEntity(org.bukkit.entity.Entity entity) {
+        Preconditions.checkNotNull(entity);
+
+        CraftEntity craftEntity = ((CraftEntity) entity);
+        Entity mcEntity = craftEntity.getHandle();
+
+        String id = getEntityId(mcEntity);
+        EntityType type = com.sk89q.worldedit.world.entity.EntityTypes.get(id);
+        Supplier<LinCompoundTag> saveTag = () -> {
+            final net.minecraft.nbt.CompoundTag minecraftTag = new net.minecraft.nbt.CompoundTag();
+            readEntityIntoTag(mcEntity, minecraftTag);
+            //add Id for AbstractChangeSet to work
+            final LinCompoundTag tag = (LinCompoundTag) toNativeLin(minecraftTag);
+            final Map<String, LinTag<?>> tags = NbtUtils.getLinCompoundTagValues(tag);
+            tags.put("Id", LinStringTag.of(id));
+            return LinCompoundTag.of(tags);
+        };
+        return new LazyBaseEntity(type, saveTag);
+
+    }
+
+    @Override
+    public Component getRichBlockName(BlockType blockType) {
+        return parent.getRichBlockName(blockType);
+    }
+
+    @Override
+    public Component getRichItemName(ItemType itemType) {
+        return parent.getRichItemName(itemType);
+    }
+
+    @Override
+    public Component getRichItemName(BaseItemStack itemStack) {
+        return parent.getRichItemName(itemStack);
+    }
+
+    @Override
+    public OptionalInt getInternalBlockStateId(BlockState state) {
+        PaperweightBlockMaterial material = (PaperweightBlockMaterial) state.getMaterial();
+        net.minecraft.world.level.block.state.BlockState mcState = material.getCraftBlockData().getState();
+        return OptionalInt.of(Block.BLOCK_STATE_REGISTRY.getId(mcState));
+    }
+
+    @Override
+    public BlockState adapt(BlockData blockData) {
+        CraftBlockData cbd = ((CraftBlockData) blockData);
+        net.minecraft.world.level.block.state.BlockState ibd = cbd.getState();
+        return adapt(ibd);
+    }
+
+    public BlockState adapt(net.minecraft.world.level.block.state.BlockState blockState) {
+        return BlockTypesCache.states[adaptToChar(blockState)];
+    }
+
+    public char adaptToChar(net.minecraft.world.level.block.state.BlockState blockState) {
+        int id = Block.BLOCK_STATE_REGISTRY.getId(blockState);
+        if (initialised) {
+            return ibdToStateOrdinal[id];
+        }
+        synchronized (this) {
+            if (initialised) {
+                return ibdToStateOrdinal[id];
+            }
+            try {
+                init();
+                return ibdToStateOrdinal[id];
+            } catch (ArrayIndexOutOfBoundsException e1) {
+                LOGGER.error("Attempted to convert {} with ID {} to char. ibdToStateOrdinal length: {}. Defaulting to air!",
+                        blockState.getBlock(), Block.BLOCK_STATE_REGISTRY.getId(blockState), ibdToStateOrdinal.length, e1
+                );
+                return BlockTypesCache.ReservedIDs.AIR;
+            }
+        }
+    }
+
+    public char ibdIDToOrdinal(int id) {
+        if (initialised) {
+            return ibdToStateOrdinal[id];
+        }
+        synchronized (this) {
+            if (initialised) {
+                return ibdToStateOrdinal[id];
+            }
+            init();
+            return ibdToStateOrdinal[id];
+        }
+    }
+
+    @Override
+    public char[] getIbdToStateOrdinal() {
+        if (initialised) {
+            return ibdToStateOrdinal;
+        }
+        synchronized (this) {
+            if (initialised) {
+                return ibdToStateOrdinal;
+            }
+            init();
+            return ibdToStateOrdinal;
+        }
+    }
+
+    public int ordinalToIbdID(char ordinal) {
+        if (initialised) {
+            return ordinalToIbdID[ordinal];
+        }
+        synchronized (this) {
+            if (initialised) {
+                return ordinalToIbdID[ordinal];
+            }
+            init();
+            return ordinalToIbdID[ordinal];
+        }
+    }
+
+    @Override
+    public int[] getOrdinalToIbdID() {
+        if (initialised) {
+            return ordinalToIbdID;
+        }
+        synchronized (this) {
+            if (initialised) {
+                return ordinalToIbdID;
+            }
+            init();
+            return ordinalToIbdID;
+        }
+    }
+
+    @Override
+    public <B extends BlockStateHolder<B>> BlockData adapt(B state) {
+        PaperweightBlockMaterial material = (PaperweightBlockMaterial) state.getMaterial();
+        return material.getCraftBlockData();
+    }
+
+    public net.minecraft.world.level.block.state.BlockState adapt(BlockState blockState) {
+        return Block.stateById(getOrdinalToIbdID()[blockState.getOrdinal()]);
+    }
+
+    @Override
+    public void sendFakeChunk(org.bukkit.World world, Player player, ChunkPacket chunkPacket) {
+        ServerLevel nmsWorld = getServerLevel(world);
+        ChunkHolder map = PaperweightPlatformAdapter.getPlayerChunk(nmsWorld, chunkPacket.getChunkX(), chunkPacket.getChunkZ());
+        if (map != null && wasAccessibleSinceLastSave(map)) {
+            boolean flag = false;
+            // PlayerChunk.d players = map.players;
+            Stream<ServerPlayer> stream = /*players.a(new ChunkCoordIntPair(packet.getChunkX(), packet.getChunkZ()), flag)
+             */ Stream.empty();
+
+            ServerPlayer checkPlayer = player == null ? null : ((CraftPlayer) player).getHandle();
+            stream.filter(entityPlayer -> checkPlayer == null || entityPlayer == checkPlayer)
+                    .forEach(entityPlayer -> {
+                        synchronized (chunkPacket) {
+                            ClientboundLevelChunkWithLightPacket nmsPacket = (ClientboundLevelChunkWithLightPacket) chunkPacket.getNativePacket();
+                            if (nmsPacket == null) {
+                                nmsPacket = mapUtil.create(this, chunkPacket);
+                                chunkPacket.setNativePacket(nmsPacket);
+                            }
+                            try {
+                                FaweCache.INSTANCE.CHUNK_FLAG.get().set(true);
+                                entityPlayer.connection.send(nmsPacket);
+                            } finally {
+                                FaweCache.INSTANCE.CHUNK_FLAG.get().set(false);
+                            }
+                        }
+                    });
+        }
+    }
+
+    @Override
+    public Map<String, ? extends Property<?>> getProperties(BlockType blockType) {
+        return getParent().getProperties(blockType);
+    }
+
+    @Override
+    public boolean canPlaceAt(org.bukkit.World world, BlockVector3 blockVector3, BlockState blockState) {
+        int internalId = BlockStateIdAccess.getBlockStateId(blockState);
+        net.minecraft.world.level.block.state.BlockState blockState1 = Block.stateById(internalId);
+        return blockState1.hasPostProcess(
+                getServerLevel(world),
+                new BlockPos(blockVector3.x(), blockVector3.y(), blockVector3.z())
+        );
+    }
+
+    @Override
+    public org.bukkit.inventory.ItemStack adapt(BaseItemStack baseItemStack) {
+        final RegistryAccess.Frozen registryAccess = DedicatedServer.getServer().registryAccess();
+        ItemStack stack = new ItemStack(
+                registryAccess.lookupOrThrow(Registries.ITEM).getValueOrThrow(ResourceKey.create(
+                        Registries.ITEM, ResourceLocation.parse(baseItemStack.getType().id())
+                )),
+                baseItemStack.getAmount()
+        );
+        final CompoundTag nbt = (net.minecraft.nbt.CompoundTag) fromNativeLin(baseItemStack.getNbt());
+        if (nbt != null) {
+            final DataComponentPatch patch = COMPONENTS_CODEC
+                    .parse(registryAccess.createSerializationContext(NbtOps.INSTANCE), nbt)
+                    .getOrThrow();
+            stack.applyComponents(patch);
+        }
+        return CraftItemStack.asCraftMirror(stack);
+    }
+
+    @Override
+    protected void preCaptureStates(final ServerLevel serverLevel) {
+        serverLevel.captureTreeGeneration = true;
+        serverLevel.captureBlockStates = true;
+    }
+
+    @Override
+    protected List<org.bukkit.block.BlockState> getCapturedBlockStatesCopy(final ServerLevel serverLevel) {
+        return new ArrayList<>(serverLevel.capturedBlockStates.values());
+    }
+
+    @Override
+    protected void postCaptureBlockStates(final ServerLevel serverLevel) {
+        serverLevel.captureBlockStates = false;
+        serverLevel.captureTreeGeneration = false;
+        serverLevel.capturedBlockStates.clear();
+    }
+
+    @Override
+    protected ServerLevel getServerLevel(final World world) {
+        return ((CraftWorld) world).getHandle();
+    }
+
+    @Override
+    public BaseItemStack adapt(org.bukkit.inventory.ItemStack itemStack) {
+        final RegistryAccess.Frozen registryAccess = DedicatedServer.getServer().registryAccess();
+        final ItemStack nmsStack = CraftItemStack.asNMSCopy(itemStack);
+        final net.minecraft.nbt.Tag tag = COMPONENTS_CODEC.encodeStart(
+                registryAccess.createSerializationContext(NbtOps.INSTANCE),
+                nmsStack.getComponentsPatch()
+        ).getOrThrow();
+        return new BaseItemStack(
+                BukkitAdapter.asItemType(itemStack.getType()),
+                LazyReference.from(() -> (LinCompoundTag) toNativeLin(tag)),
+                itemStack.getAmount()
+        );
+    }
+
+    @Override
+    public Tag toNative(net.minecraft.nbt.Tag foreign) {
+        return parent.toNative(foreign);
+    }
+
+    @Override
+    public net.minecraft.nbt.Tag fromNative(Tag foreign) {
+        return parent.fromNative(foreign);
+    }
+
+    @Override
+    public boolean regenerate(org.bukkit.World bukkitWorld, Region region, Extent target, RegenOptions options) throws Exception {
+        return new PaperweightRegen(bukkitWorld, region, target, options).regenerate();
+    }
+
+    @Override
+    public IChunkGet get(org.bukkit.World world, int chunkX, int chunkZ) {
+        return new PaperweightGetBlocks(world, chunkX, chunkZ);
+    }
+
+    @Override
+    public int getInternalBiomeId(BiomeType biomeType) {
+        final Registry<Biome> registry = MinecraftServer
+                .getServer()
+                .registryAccess()
+                .lookupOrThrow(BIOME);
+        ResourceLocation resourceLocation = ResourceLocation.tryParse(biomeType.id());
+        Biome biome = registry.getValue(resourceLocation);
+        return registry.getId(biome);
+    }
+
+    @Override
+    public Iterable<NamespacedKey> getRegisteredBiomes() {
+        WritableRegistry<Biome> biomeRegistry = (WritableRegistry<Biome>) ((CraftServer) Bukkit.getServer())
+                .getServer()
+                .registryAccess()
+                .lookupOrThrow(BIOME);
+        List<ResourceLocation> keys = biomeRegistry.stream()
+                .map(biomeRegistry::getKey).filter(Objects::nonNull).toList();
+        List<NamespacedKey> namespacedKeys = new ArrayList<>();
+        for (ResourceLocation key : keys) {
+            try {
+                namespacedKeys.add(CraftNamespacedKey.fromMinecraft(key));
+            } catch (IllegalArgumentException e) {
+                LOGGER.error("Error converting biome key {}", key.toString(), e);
+            }
+        }
+        return namespacedKeys;
+    }
+
+    @Override
+    public RelighterFactory getRelighterFactory() {
+        if (PaperLib.isPaper()) {
+            return new PaperweightStarlightRelighterFactory();
+        } else {
+            return new NMSRelighterFactory();
+        }
+    }
+
+    @Override
+    public Map<String, List<Property<?>>> getAllProperties() {
+        if (initialised) {
+            return allBlockProperties;
+        }
+        synchronized (this) {
+            if (initialised) {
+                return allBlockProperties;
+            }
+            init();
+            return allBlockProperties;
+        }
+    }
+
+    @Override
+    public IBatchProcessor getTickingPostProcessor() {
+        return new PaperweightPostProcessor();
+    }
+
+    @Override
+    public PlacementStateProcessor getPlatformPlacementProcessor(Extent extent, BlockTypeMask mask, Region region) {
+        return new PaperweightPlacementStateProcessor(extent, mask, region);
+    }
+
+    private boolean wasAccessibleSinceLastSave(ChunkHolder holder) {
+        if (PaperLib.isPaper()) { // Papers new chunk system has no related replacement - therefor we assume true.
+            return true;
+        }
+        try {
+            return (boolean) CHUNK_HOLDER_WAS_ACCESSIBLE_SINCE_LAST_SAVE.invoke(holder);
+        } catch (IllegalAccessException | InvocationTargetException ignored) {
+            return false;
+        }
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightFaweMutableBlockPlaceContext.java

@@ -0,0 +1,143 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.Vec3;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
+
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
+            Direction.NORTH,
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
+            false
+    );
+    private final ServerLevel level;
+    private BlockHitResult hitResult = null;
+    private Direction direction = null;
+    private BlockPos relativePos;
+
+    @SuppressWarnings("DataFlowIssue")
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
+        super(
+                level,
+                null,
+                null,
+                null,
+                DEFAULT_BLOCK_HIT
+
+        );
+        this.level = level;
+        this.replaceClicked = false;
+    }
+
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+        this.hitResult = hitResult;
+        this.direction = direction;
+        this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());
+        return this;
+    }
+
+    @Override
+    @Nonnull
+    public BlockPos getClickedPos() {
+        return this.relativePos;
+    }
+
+    @Override
+    @Nonnull
+    public Direction getClickedFace() {
+        return this.hitResult.getDirection();
+    }
+
+    @Override
+    @Nonnull
+    public Vec3 getClickLocation() {
+        return this.hitResult.getLocation();
+    }
+
+    @Override
+    public boolean isInside() {
+        return this.hitResult.isInside();
+    }
+
+    @Override
+    @SuppressWarnings("NullableProblems")
+    public ItemStack getItemInHand() {
+        return ItemStack.EMPTY;
+    }
+
+    @Nullable
+    @Override
+    public Player getPlayer() {
+        return null;
+    }
+
+    @Override
+    @SuppressWarnings("NullableProblems")
+    public InteractionHand getHand() {
+        return null;
+    }
+
+    @Override
+    @Nonnull
+    public Level getLevel() {
+        return this.level;
+    }
+
+    @Override
+    @Nonnull
+    public Direction getHorizontalDirection() {
+        return this.direction.getAxis() == Direction.Axis.Y ? Direction.NORTH : this.direction;
+    }
+
+    @Override
+    public boolean isSecondaryUseActive() {
+        return false;
+    }
+
+    @Override
+    public float getRotation() {
+        return (float) (this.direction.get2DDataValue() * 90);
+    }
+
+    @Override
+    public boolean canPlace() {
+        return this.getLevel().getBlockState(this.getClickedPos()).canBeReplaced(this);
+    }
+
+    @Override
+    public boolean replacingClickedOnBlock() {
+        return false;
+    }
+
+    @Override
+    @Nonnull
+    public Direction getNearestLookingDirection() {
+        return direction;
+    }
+
+    @Override
+    @Nonnull
+    public Direction getNearestLookingVerticalDirection() {
+        return direction.getAxis() == Direction.Axis.Y ? Direction.UP : Direction.DOWN;
+    }
+
+    @Override
+    @Nonnull
+    public Direction[] getNearestLookingDirections() {
+        return new Direction[]{direction};
+    }
+
+}
+

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightFaweWorldNativeAccess.java

@@ -0,0 +1,294 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.Fawe;
+import com.fastasyncworldedit.core.math.IntPair;
+import com.fastasyncworldedit.core.util.TaskManager;
+import com.fastasyncworldedit.core.util.task.RunnableVal;
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.internal.block.BlockStateIdAccess;
+import com.sk89q.worldedit.internal.wna.WorldNativeAccess;
+import com.sk89q.worldedit.util.SideEffect;
+import com.sk89q.worldedit.util.SideEffectSet;
+import com.sk89q.worldedit.world.block.BlockState;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.level.FullChunkStatus;
+import net.minecraft.server.level.ServerChunkCache;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.redstone.ExperimentalRedstoneUtils;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockPhysicsEvent;
+import org.enginehub.linbus.tree.LinCompoundTag;
+
+import javax.annotation.Nullable;
+import java.lang.ref.WeakReference;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<LevelChunk,
+        net.minecraft.world.level.block.state.BlockState, BlockPos> {
+
+    private static final int UPDATE = 1;
+    private static final int NOTIFY = 2;
+    private static final Direction[] NEIGHBOUR_ORDER = {
+            Direction.EAST,
+            Direction.WEST,
+            Direction.DOWN,
+            Direction.UP,
+            Direction.NORTH,
+            Direction.SOUTH
+    };
+    private final PaperweightFaweAdapter paperweightFaweAdapter;
+    private final WeakReference<Level> level;
+    private final AtomicInteger lastTick;
+    private final Set<CachedChange> cachedChanges = new HashSet<>();
+    private final Set<IntPair> cachedChunksToSend = new HashSet<>();
+    private SideEffectSet sideEffectSet;
+
+    public PaperweightFaweWorldNativeAccess(PaperweightFaweAdapter paperweightFaweAdapter, WeakReference<Level> level) {
+        this.paperweightFaweAdapter = paperweightFaweAdapter;
+        this.level = level;
+        // Use the actual tick as minecraft-defined so we don't try to force blocks into the world when the server's already lagging.
+        //  - With the caveat that we don't want to have too many cached changed (1024) so we'd flush those at 1024 anyway.
+        this.lastTick = new AtomicInteger(MinecraftServer.currentTick);
+    }
+
+    private Level getLevel() {
+        return Objects.requireNonNull(level.get(), "The reference to the world was lost");
+    }
+
+    @Override
+    public void setCurrentSideEffectSet(SideEffectSet sideEffectSet) {
+        this.sideEffectSet = sideEffectSet;
+    }
+
+    @Override
+    public LevelChunk getChunk(int x, int z) {
+        return getLevel().getChunk(x, z);
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState toNative(BlockState blockState) {
+        int stateId = paperweightFaweAdapter.ordinalToIbdID(blockState.getOrdinalChar());
+        return BlockStateIdAccess.isValidInternalId(stateId)
+                ? Block.stateById(stateId)
+                : ((CraftBlockData) BukkitAdapter.adapt(blockState)).getState();
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState getBlockState(LevelChunk levelChunk, BlockPos blockPos) {
+        return levelChunk.getBlockState(blockPos);
+    }
+
+    @Nullable
+    @Override
+    public synchronized net.minecraft.world.level.block.state.BlockState setBlockState(
+            LevelChunk levelChunk, BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState blockState
+    ) {
+        int currentTick = MinecraftServer.currentTick;
+        if (Fawe.isMainThread()) {
+            return levelChunk.setBlockState(blockPos, blockState,
+                    this.sideEffectSet != null && this.sideEffectSet.shouldApply(SideEffect.UPDATE)
+            );
+        }
+        // Since FAWE is.. Async we need to do it on the main thread (wooooo.. :( )
+        cachedChanges.add(new CachedChange(levelChunk, blockPos, blockState));
+        cachedChunksToSend.add(new IntPair(levelChunk.locX, levelChunk.locZ));
+        boolean nextTick = lastTick.get() > currentTick;
+        if (nextTick || cachedChanges.size() >= 1024) {
+            if (nextTick) {
+                lastTick.set(currentTick);
+            }
+            flushAsync(nextTick);
+        }
+        return blockState;
+    }
+
+    @Override
+    public net.minecraft.world.level.block.state.BlockState getValidBlockForPosition(
+            net.minecraft.world.level.block.state.BlockState blockState,
+            BlockPos blockPos
+    ) {
+        return Block.updateFromNeighbourShapes(blockState, getLevel(), blockPos);
+    }
+
+    @Override
+    public BlockPos getPosition(int x, int y, int z) {
+        return new BlockPos(x, y, z);
+    }
+
+    @Override
+    public void updateLightingForBlock(BlockPos blockPos) {
+        getLevel().getChunkSource().getLightEngine().checkBlock(blockPos);
+    }
+
+    @Override
+    public boolean updateTileEntity(BlockPos blockPos, LinCompoundTag tag) {
+        // We will assume that the tile entity was created for us,
+        // though we do not do this on the other versions
+        BlockEntity blockEntity = getLevel().getBlockEntity(blockPos);
+        if (blockEntity == null) {
+            return false;
+        }
+        net.minecraft.nbt.Tag nativeTag = paperweightFaweAdapter.fromNativeLin(tag);
+        blockEntity.loadWithComponents((CompoundTag) nativeTag, DedicatedServer.getServer().registryAccess());
+        return true;
+    }
+
+    @Override
+    public void notifyBlockUpdate(
+            LevelChunk levelChunk, BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState oldState,
+            net.minecraft.world.level.block.state.BlockState newState
+    ) {
+        if (levelChunk.getSections()[level.get().getSectionIndex(blockPos.getY())] != null) {
+            getLevel().sendBlockUpdated(blockPos, oldState, newState, UPDATE | NOTIFY);
+        }
+    }
+
+    @Override
+    public boolean isChunkTicking(LevelChunk levelChunk) {
+        return levelChunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING);
+    }
+
+    @Override
+    public void markBlockChanged(LevelChunk levelChunk, BlockPos blockPos) {
+        if (levelChunk.getSections()[level.get().getSectionIndex(blockPos.getY())] != null) {
+            ((ServerChunkCache) getLevel().getChunkSource()).blockChanged(blockPos);
+        }
+    }
+
+    @Override
+    public void notifyNeighbors(
+            BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState oldState,
+            net.minecraft.world.level.block.state.BlockState newState
+    ) {
+        Level level = getLevel();
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            level.blockUpdated(blockPos, oldState.getBlock());
+        } else {
+            // When we don't want events, manually run the physics without them.
+            // Un-nest neighbour updating
+            for (Direction direction : NEIGHBOUR_ORDER) {
+                BlockPos shifted = blockPos.relative(direction);
+                level.getBlockState(shifted).handleNeighborChanged(level, shifted, oldState.getBlock(), ExperimentalRedstoneUtils.initialOrientation(level, null, null), false);
+            }
+        }
+        if (newState.hasAnalogOutputSignal()) {
+            level.updateNeighbourForOutputSignal(blockPos, newState.getBlock());
+        }
+    }
+
+    @Override
+    public void updateNeighbors(
+            BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState oldState,
+            net.minecraft.world.level.block.state.BlockState newState,
+            int recursionLimit
+    ) {
+        Level level = getLevel();
+        // a == updateNeighbors
+        // b == updateDiagonalNeighbors
+        oldState.updateIndirectNeighbourShapes(level, blockPos, NOTIFY, recursionLimit);
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            CraftWorld craftWorld = level.getWorld();
+            if (craftWorld != null) {
+                BlockPhysicsEvent event = new BlockPhysicsEvent(
+                        craftWorld.getBlockAt(blockPos.getX(), blockPos.getY(), blockPos.getZ()),
+                        CraftBlockData.fromData(newState)
+                );
+                level.getCraftServer().getPluginManager().callEvent(event);
+                if (event.isCancelled()) {
+                    return;
+                }
+            }
+        }
+        newState.triggerEvent(level, blockPos, NOTIFY, recursionLimit);
+        newState.updateIndirectNeighbourShapes(level, blockPos, NOTIFY, recursionLimit);
+    }
+
+    @Override
+    public void updateBlock(BlockPos pos, net.minecraft.world.level.block.state.BlockState oldState, net.minecraft.world.level.block.state.BlockState newState) {
+        Level world = getLevel();
+        newState.onPlace(world, pos, oldState, false);
+    }
+
+    @Override
+    public void onBlockStateChange(
+            BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState oldState,
+            net.minecraft.world.level.block.state.BlockState newState
+    ) {
+        getLevel().onBlockStateChange(blockPos, oldState, newState);
+    }
+
+    private synchronized void flushAsync(final boolean sendChunks) {
+        final Set<CachedChange> changes = Set.copyOf(cachedChanges);
+        cachedChanges.clear();
+        final Set<IntPair> toSend;
+        if (sendChunks) {
+            toSend = Set.copyOf(cachedChunksToSend);
+            cachedChunksToSend.clear();
+        } else {
+            toSend = Collections.emptySet();
+        }
+        RunnableVal<Object> runnableVal = new RunnableVal<>() {
+            @Override
+            public void run(Object value) {
+                changes.forEach(cc -> cc.levelChunk.setBlockState(cc.blockPos, cc.blockState,
+                        sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
+                ));
+                if (!sendChunks) {
+                    return;
+                }
+                for (IntPair chunk : toSend) {
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
+                }
+            }
+        };
+        TaskManager.taskManager().async(() -> TaskManager.taskManager().sync(runnableVal));
+    }
+
+    @Override
+    public synchronized void flush() {
+        RunnableVal<Object> runnableVal = new RunnableVal<>() {
+            @Override
+            public void run(Object value) {
+                cachedChanges.forEach(cc -> cc.levelChunk.setBlockState(cc.blockPos, cc.blockState,
+                        sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
+                ));
+                for (IntPair chunk : cachedChunksToSend) {
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
+                }
+            }
+        };
+        if (Fawe.isMainThread()) {
+            runnableVal.run();
+        } else {
+            TaskManager.taskManager().sync(runnableVal);
+        }
+        cachedChanges.clear();
+        cachedChunksToSend.clear();
+    }
+
+    private record CachedChange(
+            LevelChunk levelChunk,
+            BlockPos blockPos,
+            net.minecraft.world.level.block.state.BlockState blockState
+    ) {
+
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightGetBlocks_Copy.java

@@ -0,0 +1,276 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.extent.processor.heightmap.HeightMapType;
+import com.fastasyncworldedit.core.nbt.FaweCompoundTag;
+import com.fastasyncworldedit.core.queue.IBlocks;
+import com.fastasyncworldedit.core.queue.IChunkGet;
+import com.fastasyncworldedit.core.queue.IChunkSet;
+import com.fastasyncworldedit.core.util.NbtUtils;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import com.sk89q.worldedit.bukkit.adapter.BukkitImplAdapter;
+import com.sk89q.worldedit.internal.util.LogManagerCompat;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.world.biome.BiomeType;
+import com.sk89q.worldedit.world.block.BaseBlock;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockTypesCache;
+import io.papermc.lib.PaperLib;
+import net.minecraft.core.Holder;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.chunk.PalettedContainer;
+import net.minecraft.world.level.chunk.PalettedContainerRO;
+import org.apache.logging.log4j.Logger;
+import org.enginehub.linbus.tree.LinCompoundTag;
+
+import javax.annotation.Nullable;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.Future;
+
+public class PaperweightGetBlocks_Copy implements IChunkGet {
+
+    private static final Logger LOGGER = LogManagerCompat.getLogger();
+
+    private final Map<BlockVector3, FaweCompoundTag> tiles = new HashMap<>();
+    private final Set<FaweCompoundTag> entities = new HashSet<>();
+    private final char[][] blocks;
+    private final int minHeight;
+    private final int maxHeight;
+    final ServerLevel serverLevel;
+    final LevelChunk levelChunk;
+    private Holder<Biome>[][] biomes = null;
+
+    protected PaperweightGetBlocks_Copy(LevelChunk levelChunk) {
+        this.levelChunk = levelChunk;
+        this.serverLevel = levelChunk.level;
+        this.minHeight = serverLevel.getMinY();
+        this.maxHeight = serverLevel.getMaxY() - 1; // Minecraft max limit is exclusive.
+        this.blocks = new char[getSectionCount()][];
+    }
+
+    protected void storeTile(BlockEntity blockEntity) {
+        @SuppressWarnings("unchecked")
+        BukkitImplAdapter<Tag> adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
+        tiles.put(
+                BlockVector3.at(
+                        blockEntity.getBlockPos().getX(),
+                        blockEntity.getBlockPos().getY(),
+                        blockEntity.getBlockPos().getZ()
+                ),
+                FaweCompoundTag.of((LinCompoundTag) adapter.toNativeLin(blockEntity.saveWithId(DedicatedServer
+                        .getServer()
+                        .registryAccess())))
+        );
+    }
+
+    protected void storeEntity(Entity entity) {
+        @SuppressWarnings("unchecked")
+        BukkitImplAdapter<Tag> adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
+        net.minecraft.nbt.CompoundTag compoundTag = new net.minecraft.nbt.CompoundTag();
+        entity.save(compoundTag);
+        entities.add(FaweCompoundTag.of((LinCompoundTag) adapter.toNativeLin(compoundTag)));
+    }
+
+    @Override
+    public Collection<FaweCompoundTag> entities() {
+        return this.entities;
+    }
+
+    @Override
+    public @Nullable FaweCompoundTag entity(final UUID uuid) {
+        for (FaweCompoundTag tag : entities) {
+            if (uuid.equals(NbtUtils.uuid(tag))) {
+                return tag;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public boolean isCreateCopy() {
+        return false;
+    }
+
+    @Override
+    public int setCreateCopy(boolean createCopy) {
+        return -1;
+    }
+
+    @Override
+    public void setLightingToGet(char[][] lighting, int minSectionPosition, int maxSectionPosition) {
+    }
+
+    @Override
+    public void setSkyLightingToGet(char[][] lighting, int minSectionPosition, int maxSectionPosition) {
+    }
+
+    @Override
+    public void setHeightmapToGet(HeightMapType type, int[] data) {
+    }
+
+    @Override
+    public int getMaxY() {
+        return maxHeight;
+    }
+
+    @Override
+    public int getMinY() {
+        return minHeight;
+    }
+
+    @Override
+    public int getMaxSectionPosition() {
+        return maxHeight >> 4;
+    }
+
+    @Override
+    public int getMinSectionPosition() {
+        return minHeight >> 4;
+    }
+
+    @Override
+    public BiomeType getBiomeType(int x, int y, int z) {
+        Holder<Biome> biome = biomes[(y >> 4) - getMinSectionPosition()][(y & 12) << 2 | (z & 12) | (x & 12) >> 2];
+        return PaperweightPlatformAdapter.adapt(biome, serverLevel);
+    }
+
+    @Override
+    public void removeSectionLighting(int layer, boolean sky) {
+    }
+
+    @Override
+    public boolean trim(boolean aggressive, int layer) {
+        return false;
+    }
+
+    @Override
+    public IBlocks reset() {
+        return null;
+    }
+
+    @Override
+    public int getSectionCount() {
+        return serverLevel.getSectionsCount();
+    }
+
+    protected void storeSection(int layer, char[] data) {
+        blocks[layer] = data;
+    }
+
+    protected void storeBiomes(int layer, PalettedContainerRO<Holder<Biome>> biomeData) {
+        if (biomes == null) {
+            biomes = new Holder[getSectionCount()][];
+        }
+        if (biomes[layer] == null) {
+            biomes[layer] = new Holder[64];
+        }
+        if (biomeData instanceof PalettedContainer<Holder<Biome>> palettedContainer) {
+            if (PaperLib.isPaper()) {
+                for (int i = 0; i < 64; i++) {
+                    biomes[layer][i] = palettedContainer.get(i); // Only public on paper
+                }
+            } else {
+                try {
+                    for (int i = 0; i < 64; i++) {
+                        biomes[layer][i] = (Holder<Biome>) PaperweightPlatformAdapter.PALETTED_CONTAINER_GET.invoke(i);
+                    }
+                } catch (Throwable e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        } else {
+            LOGGER.error(
+                    "Cannot correctly save biomes to history. Expected class type {} but got {}",
+                    PalettedContainer.class.getSimpleName(),
+                    biomeData.getClass().getSimpleName()
+            );
+        }
+    }
+
+    @Override
+    public BaseBlock getFullBlock(int x, int y, int z) {
+        BlockState state = BlockTypesCache.states[get(x, y, z)];
+        return state.toBaseBlock((IBlocks) this, x, y, z);
+    }
+
+    @Override
+    public boolean hasSection(int layer) {
+        layer -= getMinSectionPosition();
+        return blocks[layer] != null;
+    }
+
+    @Override
+    public char[] load(int layer) {
+        layer -= getMinSectionPosition();
+        if (blocks[layer] == null) {
+            blocks[layer] = new char[4096];
+            Arrays.fill(blocks[layer], (char) BlockTypesCache.ReservedIDs.AIR);
+        }
+        return blocks[layer];
+    }
+
+    @Override
+    public char[] loadIfPresent(int layer) {
+        layer -= getMinSectionPosition();
+        return blocks[layer];
+    }
+
+    @Override
+    public BlockState getBlock(int x, int y, int z) {
+        return BlockTypesCache.states[get(x, y, z)];
+    }
+
+    @Override
+    public Map<BlockVector3, FaweCompoundTag> tiles() {
+        return tiles;
+    }
+
+    @Override
+    public @Nullable FaweCompoundTag tile(final int x, final int y, final int z) {
+        return tiles.get(BlockVector3.at(x, y, z));
+    }
+
+    @Override
+    public int getSkyLight(int x, int y, int z) {
+        return 0;
+    }
+
+    @Override
+    public int getEmittedLight(int x, int y, int z) {
+        return 0;
+    }
+
+    @Override
+    public int[] getHeightMap(HeightMapType type) {
+        return new int[0];
+    }
+
+    @Override
+    public <T extends Future<T>> T call(IChunkSet set, Runnable finalize) {
+        return null;
+    }
+
+    public char get(int x, int y, int z) {
+        final int layer = (y >> 4) - getMinSectionPosition();
+        final int index = (y & 15) << 8 | z << 4 | x;
+        return blocks[layer][index];
+    }
+
+
+    @Override
+    public boolean trim(boolean aggressive) {
+        return false;
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightLevelProxy.java

@@ -0,0 +1,136 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.util.ReflectionUtils;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import net.minecraft.core.BlockPos;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.tags.FluidTags;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.border.WorldBorder;
+import net.minecraft.world.level.material.FluidState;
+import net.minecraft.world.level.material.Fluids;
+import org.enginehub.linbus.tree.LinCompoundTag;
+import sun.misc.Unsafe;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class PaperweightLevelProxy extends ServerLevel {
+
+    protected ServerLevel serverLevel;
+    private PaperweightPlacementStateProcessor processor;
+    private PaperweightFaweAdapter adapter;
+
+    @SuppressWarnings("DataFlowIssue")
+    private PaperweightLevelProxy() {
+        super(null, null, null, null, null, null, null, true, 0L, null, true, null, null, null, null);
+        throw new IllegalStateException("Cannot be instantiated");
+    }
+
+    public static PaperweightLevelProxy getInstance(ServerLevel serverLevel, PaperweightPlacementStateProcessor processor) {
+        Unsafe unsafe = ReflectionUtils.getUnsafe();
+
+        PaperweightLevelProxy newLevel;
+        try {
+            newLevel = (PaperweightLevelProxy) unsafe.allocateInstance(PaperweightLevelProxy.class);
+        } catch (InstantiationException e) {
+            throw new RuntimeException(e);
+        }
+        newLevel.processor = processor;
+        newLevel.adapter = ((PaperweightFaweAdapter) WorldEditPlugin.getInstance().getBukkitImplAdapter());
+        newLevel.serverLevel = serverLevel;
+        return newLevel;
+    }
+
+    @Nullable
+    @Override
+    public BlockEntity getBlockEntity(@Nonnull BlockPos blockPos) {
+        if (blockPos.getX() == Integer.MAX_VALUE) {
+            return null;
+        }
+        LinCompoundTag tag = processor.getTileAt(blockPos.getX(), blockPos.getY(), blockPos.getZ());
+        if (tag == null) {
+            return null;
+        }
+        BlockState state = adapter.adapt(processor.getBlockStateAt(blockPos.getX(), blockPos.getY(), blockPos.getZ()));
+        if (!(state.getBlock() instanceof EntityBlock entityBlock)) {
+            return null;
+        }
+        BlockEntity tileEntity = entityBlock.newBlockEntity(blockPos, state);
+        tileEntity.loadWithComponents((CompoundTag) adapter.fromNativeLin(tag), serverLevel.registryAccess());
+        return tileEntity;
+    }
+
+    @Override
+    @Nonnull
+    public BlockState getBlockState(@Nonnull BlockPos blockPos) {
+        if (blockPos.getX() == Integer.MAX_VALUE) {
+            return Blocks.AIR.defaultBlockState();
+        }
+        com.sk89q.worldedit.world.block.BlockState state = processor.getBlockStateAt(
+                blockPos.getX(),
+                blockPos.getY(),
+                blockPos.getZ()
+        );
+        return adapter.adapt(state);
+    }
+
+    @SuppressWarnings("unused")
+    @Override
+    @Nonnull
+    public FluidState getFluidState(@Nonnull BlockPos pos) {
+        if (pos.getX() == Integer.MAX_VALUE) {
+            return Fluids.EMPTY.defaultFluidState();
+        }
+        return getBlockState(pos).getFluidState();
+    }
+
+    @SuppressWarnings("unused")
+    @Override
+    public boolean isWaterAt(@Nonnull BlockPos pos) {
+        if (pos.getX() == Integer.MAX_VALUE) {
+            return false;
+        }
+        return getBlockState(pos).getFluidState().is(FluidTags.WATER);
+    }
+
+    @Override
+    public int getHeight() {
+        return serverLevel.getHeight();
+    }
+
+    @Override
+    public int getMinY() {
+        return serverLevel.getMinY();
+    }
+
+    @Override
+    public int getMaxY() {
+        return serverLevel.getMaxY();
+    }
+
+    @Override
+    public boolean isInsideBuildHeight(int blockY) {
+        return serverLevel.isInsideBuildHeight(blockY);
+    }
+
+    @Override
+    public boolean isOutsideBuildHeight(BlockPos pos) {
+        return serverLevel.isOutsideBuildHeight(pos);
+    }
+
+    @Override
+    public boolean isOutsideBuildHeight(int blockY) {
+        return serverLevel.isOutsideBuildHeight(blockY);
+    }
+
+    @Override
+    public WorldBorder getWorldBorder() {
+        return serverLevel.getWorldBorder();
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightMapChunkUtil.java

@@ -0,0 +1,34 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.bukkit.adapter.MapChunkUtil;
+import com.sk89q.worldedit.bukkit.adapter.Refraction;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+
+//TODO un-very-break-this
+public class PaperweightMapChunkUtil extends MapChunkUtil<ClientboundLevelChunkWithLightPacket> {
+
+    public PaperweightMapChunkUtil() throws NoSuchFieldException {
+        fieldX = ClientboundLevelChunkPacketData.class.getDeclaredField(Refraction.pickName("TWO_MEGABYTES", "a"));
+        fieldZ = ClientboundLevelChunkWithLightPacket.class.getDeclaredField(Refraction.pickName("x", "b"));
+        fieldBitMask = ClientboundLevelChunkWithLightPacket.class.getDeclaredField(Refraction.pickName("z", "c"));
+        fieldHeightMap = ClientboundLevelChunkPacketData.class.getDeclaredField(Refraction.pickName("heightmaps", "b"));
+        fieldChunkData = ClientboundLevelChunkWithLightPacket.class.getDeclaredField(Refraction.pickName("chunkData", "d"));
+        fieldBlockEntities = ClientboundLevelChunkPacketData.class.getDeclaredField(Refraction.pickName("buffer", "c"));
+        fieldFull = ClientboundLevelChunkPacketData.class.getDeclaredField(Refraction.pickName("blockEntitiesData", "d"));
+        fieldX.setAccessible(true);
+        fieldZ.setAccessible(true);
+        fieldBitMask.setAccessible(true);
+        fieldHeightMap.setAccessible(true);
+        fieldChunkData.setAccessible(true);
+        fieldBlockEntities.setAccessible(true);
+        fieldFull.setAccessible(true);
+    }
+
+    @Override
+    public ClientboundLevelChunkWithLightPacket createPacket() {
+        // TODO ??? return new ClientboundLevelChunkPacket();
+        throw new UnsupportedOperationException();
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightPlacementStateProcessor.java

@@ -0,0 +1,111 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.extent.processor.PlacementStateProcessor;
+import com.fastasyncworldedit.core.util.ExtentTraverser;
+import com.fastasyncworldedit.core.wrappers.WorldWrapper;
+import com.sk89q.worldedit.bukkit.BukkitWorld;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.function.mask.BlockTypeMask;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.math.Vector3;
+import com.sk89q.worldedit.regions.Region;
+import com.sk89q.worldedit.util.Direction;
+import com.sk89q.worldedit.world.World;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockTypesCache;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.Vec3;
+import org.bukkit.craftbukkit.CraftWorld;
+
+import javax.annotation.Nullable;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class PaperweightPlacementStateProcessor extends PlacementStateProcessor {
+
+    private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
+            .getInstance()
+            .getBukkitImplAdapter());
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightLevelProxy proxyLevel;
+
+    public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
+        super(extent, mask, region);
+        World world = ExtentTraverser.getWorldFromExtent(extent);
+        if (world == null) {
+            throw new UnsupportedOperationException(
+                    "World is required for PlacementStateProcessor but none found in given extent.");
+        }
+        BukkitWorld bukkitWorld;
+        if (world instanceof WorldWrapper wrapper) {
+            bukkitWorld = (BukkitWorld) wrapper.getParent();
+        } else {
+            bukkitWorld = (BukkitWorld) world;
+        }
+        this.proxyLevel = PaperweightLevelProxy.getInstance(((CraftWorld) bukkitWorld.getWorld()).getHandle(), this);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
+    }
+
+    private PaperweightPlacementStateProcessor(
+            Extent extent,
+            BlockTypeMask mask,
+            Map<SecondPass, Character> crossChunkSecondPasses,
+            ServerLevel serverLevel,
+            ThreadLocal<PlacementStateProcessor> threadProcessors,
+            Region region,
+            AtomicBoolean finished
+    ) {
+        super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
+        this.proxyLevel = PaperweightLevelProxy.getInstance(serverLevel, this);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
+    }
+
+    @Override
+    protected char getStateAtFor(
+            int x,
+            int y,
+            int z,
+            BlockState state,
+            Vector3 clickPos,
+            Direction clickedFaceDirection,
+            BlockVector3 clickedBlock
+    ) {
+        Block block = ((PaperweightBlockMaterial) state.getMaterial()).getBlock();
+        Vec3 pos = new Vec3(clickPos.x(), clickPos.y(), clickPos.z());
+        net.minecraft.core.Direction side = net.minecraft.core.Direction.valueOf(clickedFaceDirection.toString());
+        BlockPos blockPos = new BlockPos(clickedBlock.x(), clickedBlock.y(), clickedBlock.z());
+        net.minecraft.world.level.block.state.BlockState newState = block.getStateForPlacement(mutableBlockPlaceContext.withSetting(
+                new BlockHitResult(pos, side, blockPos, false),
+                side.getOpposite()
+        ));
+        return newState == null ? BlockTypesCache.ReservedIDs.AIR : adapter.ibdIDToOrdinal(Block.BLOCK_STATE_REGISTRY.getId(
+                newState));
+    }
+
+    @Override
+    @Nullable
+    public Extent construct(Extent child) {
+        if (child == getExtent()) {
+            return this;
+        }
+        return new PaperweightPlacementStateProcessor(child, mask, region);
+    }
+
+    @Override
+    public PlacementStateProcessor fork() {
+        return new PaperweightPlacementStateProcessor(
+                extent,
+                mask,
+                postCompleteSecondPasses,
+                proxyLevel.serverLevel,
+                threadProcessors,
+                region,
+                finished
+        );
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightPlatformAdapter.java

@@ -0,0 +1,720 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import ca.spottedleaf.moonrise.patches.chunk_system.level.entity.ChunkEntitySlices;
+import ca.spottedleaf.moonrise.patches.chunk_system.scheduling.ChunkHolderManager;
+import com.fastasyncworldedit.bukkit.adapter.CachedBukkitAdapter;
+import com.fastasyncworldedit.bukkit.adapter.DelegateSemaphore;
+import com.fastasyncworldedit.bukkit.adapter.NMSAdapter;
+import com.fastasyncworldedit.core.Fawe;
+import com.fastasyncworldedit.core.FaweCache;
+import com.fastasyncworldedit.core.math.BitArrayUnstretched;
+import com.fastasyncworldedit.core.math.IntPair;
+import com.fastasyncworldedit.core.util.MathMan;
+import com.fastasyncworldedit.core.util.TaskManager;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import com.sk89q.worldedit.bukkit.adapter.BukkitImplAdapter;
+import com.sk89q.worldedit.bukkit.adapter.Refraction;
+import com.sk89q.worldedit.internal.util.LogManagerCompat;
+import com.sk89q.worldedit.world.biome.BiomeType;
+import com.sk89q.worldedit.world.biome.BiomeTypes;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockTypesCache;
+import io.papermc.lib.PaperLib;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Holder;
+import net.minecraft.core.IdMap;
+import net.minecraft.core.Registry;
+import net.minecraft.network.protocol.game.ClientboundForgetLevelChunkPacket;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ChunkHolder;
+import net.minecraft.server.level.ChunkMap;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.util.BitStorage;
+import net.minecraft.util.SimpleBitStorage;
+import net.minecraft.util.ThreadingDetector;
+import net.minecraft.util.Unit;
+import net.minecraft.util.ZeroBitStorage;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.chunk.ChunkAccess;
+import net.minecraft.world.level.chunk.GlobalPalette;
+import net.minecraft.world.level.chunk.HashMapPalette;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.chunk.LevelChunkSection;
+import net.minecraft.world.level.chunk.LinearPalette;
+import net.minecraft.world.level.chunk.Palette;
+import net.minecraft.world.level.chunk.PalettedContainer;
+import net.minecraft.world.level.chunk.SingleValuePalette;
+import net.minecraft.world.level.chunk.status.ChunkStatus;
+import net.minecraft.world.level.entity.PersistentEntitySectionManager;
+import org.apache.logging.log4j.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.CraftChunk;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.function.Function;
+
+import static java.lang.invoke.MethodType.methodType;
+import static net.minecraft.core.registries.Registries.BIOME;
+
+public final class PaperweightPlatformAdapter extends NMSAdapter {
+
+    public static final Field fieldData;
+
+    public static final Constructor<?> dataConstructor;
+
+    public static final Field fieldStorage;
+    public static final Field fieldPalette;
+
+    private static final Field fieldTickingFluidCount;
+    private static final Field fieldTickingBlockCount;
+    private static final Field fieldBiomes;
+
+    private static final MethodHandle methodGetVisibleChunk;
+
+    private static final Field fieldThreadingDetector;
+    private static final Field fieldLock;
+
+    private static final MethodHandle methodRemoveGameEventListener;
+    private static final MethodHandle methodremoveTickingBlockEntity;
+
+    /*
+     * This is a workaround for the changes from https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/1fddefce1cdce44010927b888432bf70c0e88cde#src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+     * and is only needed to support 1.19.4 versions before *and* after this change.
+     */
+    private static final MethodHandle CRAFT_CHUNK_GET_HANDLE;
+
+    private static final Field fieldRemove;
+
+    private static final Logger LOGGER = LogManagerCompat.getLogger();
+
+    private static Method PAPER_CHUNK_GEN_ALL_ENTITIES;
+    private static Field SERVER_LEVEL_ENTITY_MANAGER;
+
+    static final MethodHandle PALETTED_CONTAINER_GET;
+
+    static {
+        final MethodHandles.Lookup lookup = MethodHandles.lookup();
+        try {
+            fieldData = PalettedContainer.class.getDeclaredField(Refraction.pickName("data", "d"));
+            fieldData.setAccessible(true);
+
+            Class<?> dataClazz = fieldData.getType();
+            dataConstructor = dataClazz.getDeclaredConstructors()[0];
+            dataConstructor.setAccessible(true);
+
+            fieldStorage = dataClazz.getDeclaredField(Refraction.pickName("storage", "b"));
+            fieldStorage.setAccessible(true);
+            fieldPalette = dataClazz.getDeclaredField(Refraction.pickName("palette", "c"));
+            fieldPalette.setAccessible(true);
+
+            fieldTickingFluidCount = LevelChunkSection.class.getDeclaredField(Refraction.pickName("tickingFluidCount", "g"));
+            fieldTickingFluidCount.setAccessible(true);
+            fieldTickingBlockCount = LevelChunkSection.class.getDeclaredField(Refraction.pickName("tickingBlockCount", "f"));
+            fieldTickingBlockCount.setAccessible(true);
+            Field tmpFieldBiomes;
+            try {
+                // Seems it's sometimes biomes and sometimes "i". Idk this is just easier than having to try to deal with it
+                tmpFieldBiomes = LevelChunkSection.class.getDeclaredField("biomes"); // apparently unobf
+            } catch (NoSuchFieldException ignored) {
+                tmpFieldBiomes = LevelChunkSection.class.getDeclaredField("i"); // apparently obf
+            }
+            fieldBiomes = tmpFieldBiomes;
+            fieldBiomes.setAccessible(true);
+
+            Method getVisibleChunkIfPresent = ChunkMap.class.getDeclaredMethod(
+                    Refraction.pickName(
+                            "getVisibleChunkIfPresent",
+                            "b"
+                    ), long.class
+            );
+            getVisibleChunkIfPresent.setAccessible(true);
+            methodGetVisibleChunk = lookup.unreflect(getVisibleChunkIfPresent);
+
+            if (!PaperLib.isPaper()) {
+                fieldThreadingDetector = PalettedContainer.class.getDeclaredField(Refraction.pickName("threadingDetector", "f"));
+                fieldThreadingDetector.setAccessible(true);
+                fieldLock = ThreadingDetector.class.getDeclaredField(Refraction.pickName("lock", "c"));
+                fieldLock.setAccessible(true);
+            } else {
+                // in paper, the used methods are synchronized properly
+                fieldThreadingDetector = null;
+                fieldLock = null;
+            }
+
+            Method removeGameEventListener = LevelChunk.class.getDeclaredMethod(
+                    Refraction.pickName("removeGameEventListener", "a"),
+                    BlockEntity.class,
+                    ServerLevel.class
+            );
+            removeGameEventListener.setAccessible(true);
+            methodRemoveGameEventListener = lookup.unreflect(removeGameEventListener);
+
+            Method removeBlockEntityTicker = LevelChunk.class.getDeclaredMethod(
+                    Refraction.pickName(
+                            "removeBlockEntityTicker",
+                            "k"
+                    ), BlockPos.class
+            );
+            removeBlockEntityTicker.setAccessible(true);
+            methodremoveTickingBlockEntity = lookup.unreflect(removeBlockEntityTicker);
+
+            fieldRemove = BlockEntity.class.getDeclaredField(Refraction.pickName("remove", "p"));
+            fieldRemove.setAccessible(true);
+
+            try {
+                Level.class.getDeclaredMethod("moonrise$getEntityLookup");
+                PAPER_CHUNK_GEN_ALL_ENTITIES = ChunkEntitySlices.class.getDeclaredMethod("getAllEntities");
+                PAPER_CHUNK_GEN_ALL_ENTITIES.setAccessible(true);
+            } catch (NoSuchMethodException ignored) {
+                // Non-Paper
+                SERVER_LEVEL_ENTITY_MANAGER = ServerLevel.class.getDeclaredField(Refraction.pickName("entityManager", "N"));
+                SERVER_LEVEL_ENTITY_MANAGER.setAccessible(true);
+            }
+
+            Method palettedContaienrGet = PalettedContainer.class.getDeclaredMethod(
+                    Refraction.pickName("get", "a"),
+                    int.class
+            );
+            palettedContaienrGet.setAccessible(true);
+            PALETTED_CONTAINER_GET = lookup.unreflect(palettedContaienrGet);
+        } catch (RuntimeException | Error e) {
+            throw e;
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        MethodHandle craftChunkGetHandle;
+        final MethodType type = methodType(LevelChunk.class);
+        try {
+            craftChunkGetHandle = lookup.findVirtual(CraftChunk.class, "getHandle", type);
+        } catch (NoSuchMethodException | IllegalAccessException e) {
+            try {
+                final MethodType newType = methodType(ChunkAccess.class, ChunkStatus.class);
+                craftChunkGetHandle = lookup.findVirtual(CraftChunk.class, "getHandle", newType);
+                craftChunkGetHandle = MethodHandles.insertArguments(craftChunkGetHandle, 1, ChunkStatus.FULL);
+            } catch (NoSuchMethodException | IllegalAccessException ex) {
+                throw new RuntimeException(ex);
+            }
+        }
+        CRAFT_CHUNK_GET_HANDLE = craftChunkGetHandle;
+    }
+
+    static boolean setSectionAtomic(
+            String worldName,
+            IntPair pair,
+            LevelChunkSection[] sections,
+            LevelChunkSection expected,
+            LevelChunkSection value,
+            int layer
+    ) {
+        return NMSAdapter.setSectionAtomic(worldName, pair, sections, expected, value, layer);
+    }
+
+    // There is no point in having a functional semaphore for paper servers.
+    private static final ThreadLocal<DelegateSemaphore> SEMAPHORE_THREAD_LOCAL =
+            ThreadLocal.withInitial(() -> new DelegateSemaphore(1, null));
+
+    static DelegateSemaphore applyLock(LevelChunkSection section) {
+        if (PaperLib.isPaper()) {
+            return SEMAPHORE_THREAD_LOCAL.get();
+        }
+        try {
+            synchronized (section) {
+                PalettedContainer<net.minecraft.world.level.block.state.BlockState> blocks = section.getStates();
+                ThreadingDetector currentThreadingDetector = (ThreadingDetector) fieldThreadingDetector.get(blocks);
+                synchronized (currentThreadingDetector) {
+                    Semaphore currentLock = (Semaphore) fieldLock.get(currentThreadingDetector);
+                    if (currentLock instanceof DelegateSemaphore delegateSemaphore) {
+                        return delegateSemaphore;
+                    }
+                    DelegateSemaphore newLock = new DelegateSemaphore(1, currentLock);
+                    fieldLock.set(currentThreadingDetector, newLock);
+                    return newLock;
+                }
+            }
+        } catch (Throwable e) {
+            e.printStackTrace();
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static LevelChunk ensureLoaded(ServerLevel serverLevel, int chunkX, int chunkZ) {
+        if (!PaperLib.isPaper()) {
+            LevelChunk nmsChunk = serverLevel.getChunkSource().getChunk(chunkX, chunkZ, false);
+            if (nmsChunk != null) {
+                return nmsChunk;
+            }
+            if (Fawe.isMainThread()) {
+                return serverLevel.getChunk(chunkX, chunkZ);
+            }
+        } else {
+            LevelChunk nmsChunk = serverLevel.getChunkSource().getChunkAtIfCachedImmediately(chunkX, chunkZ);
+            if (nmsChunk != null) {
+                addTicket(serverLevel, chunkX, chunkZ);
+                return nmsChunk;
+            }
+            nmsChunk = serverLevel.getChunkSource().getChunkAtIfLoadedImmediately(chunkX, chunkZ);
+            if (nmsChunk != null) {
+                addTicket(serverLevel, chunkX, chunkZ);
+                return nmsChunk;
+            }
+            // Avoid "async" methods from the main thread.
+            if (Fawe.isMainThread()) {
+                return serverLevel.getChunk(chunkX, chunkZ);
+            }
+            CompletableFuture<org.bukkit.Chunk> future = serverLevel.getWorld().getChunkAtAsync(chunkX, chunkZ, true, true);
+            try {
+                CraftChunk chunk;
+                try {
+                    chunk = (CraftChunk) future.get(10, TimeUnit.SECONDS);
+                } catch (TimeoutException e) {
+                    String world = serverLevel.getWorld().getName();
+                    // We've already taken 10 seconds we can afford to wait a little here.
+                    boolean loaded = TaskManager.taskManager().sync(() -> Bukkit.getWorld(world) != null);
+                    if (loaded) {
+                        LOGGER.warn("Chunk {},{} failed to load in 10 seconds in world {}. Retrying...", chunkX, chunkZ, world);
+                        // Retry chunk load
+                        chunk = (CraftChunk) serverLevel.getWorld().getChunkAtAsync(chunkX, chunkZ, true, true).get();
+                    } else {
+                        throw new UnsupportedOperationException("Cannot load chunk from unloaded world " + world + "!");
+                    }
+                }
+                addTicket(serverLevel, chunkX, chunkZ);
+                return (LevelChunk) CRAFT_CHUNK_GET_HANDLE.invoke(chunk);
+            } catch (Throwable e) {
+                e.printStackTrace();
+            }
+        }
+        return TaskManager.taskManager().sync(() -> serverLevel.getChunk(chunkX, chunkZ));
+    }
+
+    private static void addTicket(ServerLevel serverLevel, int chunkX, int chunkZ) {
+        // Ensure chunk is definitely loaded before applying a ticket
+        io.papermc.paper.util.MCUtil.MAIN_EXECUTOR.execute(() -> serverLevel
+                .getChunkSource()
+                .addRegionTicket(ChunkHolderManager.UNLOAD_COOLDOWN, new ChunkPos(chunkX, chunkZ), 0, Unit.INSTANCE));
+    }
+
+    public static ChunkHolder getPlayerChunk(ServerLevel nmsWorld, final int chunkX, final int chunkZ) {
+        ChunkMap chunkMap = nmsWorld.getChunkSource().chunkMap;
+        try {
+            return (ChunkHolder) methodGetVisibleChunk.invoke(chunkMap, ChunkPos.asLong(chunkX, chunkZ));
+        } catch (Throwable thr) {
+            throw new RuntimeException(thr);
+        }
+    }
+
+    @SuppressWarnings("deprecation")
+    public static void sendChunk(IntPair pair, ServerLevel nmsWorld, int chunkX, int chunkZ) {
+        ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
+        if (chunkHolder == null) {
+            return;
+        }
+        LevelChunk levelChunk;
+        if (PaperLib.isPaper()) {
+            // getChunkAtIfLoadedImmediately is paper only
+            levelChunk = nmsWorld.getChunkSource().getChunkAtIfLoadedImmediately(chunkX, chunkZ);
+        } else {
+            levelChunk = chunkHolder.getTickingChunkFuture().getNow(ChunkHolder.UNLOADED_LEVEL_CHUNK).orElse(null);
+        }
+        if (levelChunk == null) {
+            return;
+        }
+        StampLockHolder lockHolder = new StampLockHolder();
+        NMSAdapter.beginChunkPacketSend(nmsWorld.getWorld().getName(), pair, lockHolder);
+        if (lockHolder.chunkLock == null) {
+            return;
+        }
+        MinecraftServer.getServer().execute(() -> {
+            try {
+                ChunkPos pos = levelChunk.getPos();
+                ClientboundLevelChunkWithLightPacket packet;
+                if (PaperLib.isPaper()) {
+                    packet = new ClientboundLevelChunkWithLightPacket(
+                            levelChunk,
+                            nmsWorld.getLightEngine(),
+                            null,
+                            null,
+                            false // last false is to not bother with x-ray
+                    );
+                } else {
+                    // deprecated on paper - deprecation suppressed
+                    packet = new ClientboundLevelChunkWithLightPacket(
+                            levelChunk,
+                            nmsWorld.getLightEngine(),
+                            null,
+                            null
+                    );
+                }
+                nearbyPlayers(nmsWorld, pos).forEach(p -> p.connection.send(packet));
+            } finally {
+                NMSAdapter.endChunkPacketSend(nmsWorld.getWorld().getName(), pair, lockHolder);
+            }
+        });
+    }
+
+    private static List<ServerPlayer> nearbyPlayers(ServerLevel serverLevel, ChunkPos coordIntPair) {
+        return serverLevel.getChunkSource().chunkMap.getPlayers(coordIntPair, false);
+    }
+
+    /*
+    NMS conversion
+     */
+    public static LevelChunkSection newChunkSection(
+            final int layer,
+            final char[] blocks,
+            CachedBukkitAdapter adapter,
+            Registry<Biome> biomeRegistry,
+            @Nullable PalettedContainer<Holder<Biome>> biomes
+    ) {
+        return newChunkSection(layer, null, blocks, adapter, biomeRegistry, biomes);
+    }
+
+    public static LevelChunkSection newChunkSection(
+            final int layer,
+            final Function<Integer, char[]> get,
+            char[] set,
+            CachedBukkitAdapter adapter,
+            Registry<Biome> biomeRegistry,
+            @Nullable PalettedContainer<Holder<Biome>> biomes
+    ) {
+        if (set == null) {
+            return newChunkSection(biomeRegistry, biomes);
+        }
+        final int[] blockToPalette = FaweCache.INSTANCE.BLOCK_TO_PALETTE.get();
+        final int[] paletteToBlock = FaweCache.INSTANCE.PALETTE_TO_BLOCK.get();
+        final long[] blockStates = FaweCache.INSTANCE.BLOCK_STATES.get();
+        final int[] blocksCopy = FaweCache.INSTANCE.SECTION_BLOCKS.get();
+        try {
+            int num_palette;
+            if (get == null) {
+                num_palette = createPalette(blockToPalette, paletteToBlock, blocksCopy, set, adapter, null);
+            } else {
+                num_palette = createPalette(layer, blockToPalette, paletteToBlock, blocksCopy, get, set, adapter, null);
+            }
+
+            int bitsPerEntry = MathMan.log2nlz(num_palette - 1);
+            if (bitsPerEntry > 0 && bitsPerEntry < 5) {
+                bitsPerEntry = 4;
+            } else if (bitsPerEntry > 8) {
+                bitsPerEntry = MathMan.log2nlz(Block.BLOCK_STATE_REGISTRY.size() - 1);
+            }
+
+            int bitsPerEntryNonZero = Math.max(bitsPerEntry, 1); // We do want to use zero sometimes
+            final int blocksPerLong = MathMan.floorZero((double) 64 / bitsPerEntryNonZero);
+            final int blockBitArrayEnd = MathMan.ceilZero((float) 4096 / blocksPerLong);
+
+            if (num_palette == 1) {
+                for (int i = 0; i < blockBitArrayEnd; i++) {
+                    blockStates[i] = 0;
+                }
+            } else {
+                final BitArrayUnstretched bitArray = new BitArrayUnstretched(bitsPerEntryNonZero, 4096, blockStates);
+                bitArray.fromRaw(blocksCopy);
+            }
+
+            final long[] bits = Arrays.copyOfRange(blockStates, 0, blockBitArrayEnd);
+            final BitStorage nmsBits;
+            if (bitsPerEntry == 0) {
+                nmsBits = new ZeroBitStorage(4096);
+            } else {
+                nmsBits = new SimpleBitStorage(bitsPerEntry, 4096, bits);
+            }
+            List<net.minecraft.world.level.block.state.BlockState> palette;
+            if (bitsPerEntry < 9) {
+                palette = new ArrayList<>();
+                for (int i = 0; i < num_palette; i++) {
+                    int ordinal = paletteToBlock[i];
+                    blockToPalette[ordinal] = Integer.MAX_VALUE;
+                    final BlockState state = BlockTypesCache.states[ordinal];
+                    palette.add(((PaperweightBlockMaterial) state.getMaterial()).getState());
+                }
+            } else {
+                palette = List.of();
+            }
+
+            // Create palette with data
+            @SuppressWarnings("deprecation") // constructor is deprecated on paper, but needed to keep compatibility with spigot
+            final PalettedContainer<net.minecraft.world.level.block.state.BlockState> blockStatePalettedContainer =
+                    new PalettedContainer<>(
+                            Block.BLOCK_STATE_REGISTRY,
+                            PalettedContainer.Strategy.SECTION_STATES,
+                            PalettedContainer.Strategy.SECTION_STATES.getConfiguration(Block.BLOCK_STATE_REGISTRY, bitsPerEntry),
+                            nmsBits,
+                            palette
+                    );
+            if (biomes == null) {
+                IdMap<Holder<Biome>> biomeHolderIdMap = biomeRegistry.asHolderIdMap();
+                biomes = new PalettedContainer<>(
+                        biomeHolderIdMap,
+                        biomeHolderIdMap.byIdOrThrow(WorldEditPlugin
+                                .getInstance()
+                                .getBukkitImplAdapter()
+                                .getInternalBiomeId(
+                                        BiomeTypes.PLAINS)),
+                        PalettedContainer.Strategy.SECTION_BIOMES
+                );
+            }
+
+            return new LevelChunkSection(blockStatePalettedContainer, biomes);
+        } catch (final Throwable e) {
+            throw e;
+        } finally {
+            Arrays.fill(blockToPalette, Integer.MAX_VALUE);
+            Arrays.fill(paletteToBlock, Integer.MAX_VALUE);
+            Arrays.fill(blockStates, 0);
+            Arrays.fill(blocksCopy, 0);
+        }
+    }
+
+    @SuppressWarnings("deprecation") // Only deprecated in paper
+    private static LevelChunkSection newChunkSection(
+            Registry<Biome> biomeRegistry,
+            @Nullable PalettedContainer<Holder<Biome>> biomes
+    ) {
+        if (biomes == null) {
+            return new LevelChunkSection(biomeRegistry);
+        }
+        PalettedContainer<net.minecraft.world.level.block.state.BlockState> dataPaletteBlocks = new PalettedContainer<>(
+                Block.BLOCK_STATE_REGISTRY,
+                Blocks.AIR.defaultBlockState(),
+                PalettedContainer.Strategy.SECTION_STATES
+        );
+        return new LevelChunkSection(dataPaletteBlocks, biomes);
+    }
+
+    public static void setBiomesToChunkSection(LevelChunkSection section, PalettedContainer<Holder<Biome>> biomes) {
+        try {
+            fieldBiomes.set(section, biomes);
+        } catch (IllegalAccessException e) {
+            LOGGER.error("Could not set biomes to chunk section", e);
+        }
+    }
+
+    /**
+     * Create a new {@link PalettedContainer<Biome>}. Should only be used if no biome container existed beforehand.
+     */
+    public static PalettedContainer<Holder<Biome>> getBiomePalettedContainer(
+            BiomeType[] biomes,
+            IdMap<Holder<Biome>> biomeRegistry
+    ) {
+        if (biomes == null) {
+            return null;
+        }
+        BukkitImplAdapter<?> adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
+        // Don't stream this as typically will see 1-4 biomes; stream overhead is large for the small length
+        Map<BiomeType, Holder<Biome>> palette = new HashMap<>();
+        for (BiomeType biomeType : new LinkedList<>(Arrays.asList(biomes))) {
+            Holder<Biome> biome;
+            if (biomeType == null) {
+                biome = biomeRegistry.byId(adapter.getInternalBiomeId(BiomeTypes.PLAINS));
+            } else {
+                biome = biomeRegistry.byId(adapter.getInternalBiomeId(biomeType));
+            }
+            palette.put(biomeType, biome);
+        }
+        int biomeCount = palette.size();
+        int bitsPerEntry = MathMan.log2nlz(biomeCount - 1);
+        Object configuration = PalettedContainer.Strategy.SECTION_STATES.getConfiguration(
+                new FakeIdMapBiome(biomeCount),
+                bitsPerEntry
+        );
+        if (bitsPerEntry > 3) {
+            bitsPerEntry = MathMan.log2nlz(biomeRegistry.size() - 1);
+        }
+        PalettedContainer<Holder<Biome>> biomePalettedContainer = new PalettedContainer<>(
+                biomeRegistry,
+                biomeRegistry.byIdOrThrow(adapter.getInternalBiomeId(BiomeTypes.PLAINS)),
+                PalettedContainer.Strategy.SECTION_BIOMES
+        );
+
+        final Palette<Holder<Biome>> biomePalette;
+        if (bitsPerEntry == 0) {
+            biomePalette = new SingleValuePalette<>(
+                    biomePalettedContainer.registry,
+                    biomePalettedContainer,
+                    new ArrayList<>(palette.values()) // Must be modifiable
+            );
+        } else if (bitsPerEntry == 4) {
+            biomePalette = LinearPalette.create(
+                    4,
+                    biomePalettedContainer.registry,
+                    biomePalettedContainer,
+                    new ArrayList<>(palette.values()) // Must be modifiable
+            );
+        } else if (bitsPerEntry < 9) {
+            biomePalette = HashMapPalette.create(
+                    bitsPerEntry,
+                    biomePalettedContainer.registry,
+                    biomePalettedContainer,
+                    new ArrayList<>(palette.values()) // Must be modifiable
+            );
+        } else {
+            biomePalette = GlobalPalette.create(
+                    bitsPerEntry,
+                    biomePalettedContainer.registry,
+                    biomePalettedContainer,
+                    null // unused
+            );
+        }
+
+        int bitsPerEntryNonZero = Math.max(bitsPerEntry, 1); // We do want to use zero sometimes
+        final int blocksPerLong = MathMan.floorZero((double) 64 / bitsPerEntryNonZero);
+        final int arrayLength = MathMan.ceilZero(64f / blocksPerLong);
+
+
+        BitStorage bitStorage = bitsPerEntry == 0 ? new ZeroBitStorage(64) : new SimpleBitStorage(
+                bitsPerEntry,
+                64,
+                new long[arrayLength]
+        );
+
+        try {
+            Object data = dataConstructor.newInstance(configuration, bitStorage, biomePalette);
+            fieldData.set(biomePalettedContainer, data);
+            int index = 0;
+            for (int y = 0; y < 4; y++) {
+                for (int z = 0; z < 4; z++) {
+                    for (int x = 0; x < 4; x++, index++) {
+                        BiomeType biomeType = biomes[index];
+                        if (biomeType == null) {
+                            continue;
+                        }
+                        Holder<Biome> biome = biomeRegistry.byId(WorldEditPlugin
+                                .getInstance()
+                                .getBukkitImplAdapter()
+                                .getInternalBiomeId(biomeType));
+                        if (biome == null) {
+                            continue;
+                        }
+                        biomePalettedContainer.set(x, y, z, biome);
+                    }
+                }
+            }
+        } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
+        return biomePalettedContainer;
+    }
+
+    public static void clearCounts(final LevelChunkSection section) throws IllegalAccessException {
+        fieldTickingFluidCount.setShort(section, (short) 0);
+        fieldTickingBlockCount.setShort(section, (short) 0);
+    }
+
+    public static BiomeType adapt(Holder<Biome> biome, LevelAccessor levelAccessor) {
+        final Registry<Biome> biomeRegistry = levelAccessor.registryAccess().lookupOrThrow(BIOME);
+        if (biomeRegistry.getKey(biome.value()) == null) {
+            return biomeRegistry.asHolderIdMap().getId(biome) == -1 ? BiomeTypes.OCEAN
+                    : null;
+        }
+        return BiomeTypes.get(biome.unwrapKey().orElseThrow().location().toString());
+    }
+
+    static void removeBeacon(BlockEntity beacon, LevelChunk levelChunk) {
+        try {
+            if (levelChunk.loaded || levelChunk.level.isClientSide()) {
+                BlockEntity blockEntity = levelChunk.blockEntities.remove(beacon.getBlockPos());
+                if (blockEntity != null) {
+                    if (!levelChunk.level.isClientSide) {
+                        methodRemoveGameEventListener.invoke(levelChunk, beacon, levelChunk.level);
+                    }
+                    fieldRemove.set(beacon, true);
+                }
+            }
+            methodremoveTickingBlockEntity.invoke(levelChunk, beacon.getBlockPos());
+        } catch (Throwable throwable) {
+            throwable.printStackTrace();
+        }
+    }
+
+    static List<Entity> getEntities(LevelChunk chunk) {
+        if (PaperLib.isPaper()) {
+            try {
+                //noinspection unchecked
+                return (List<Entity>) PAPER_CHUNK_GEN_ALL_ENTITIES.invoke(chunk.level
+                        .moonrise$getEntityLookup()
+                        .getChunk(chunk.locX, chunk.locZ));
+            } catch (IllegalAccessException | InvocationTargetException e) {
+                throw new RuntimeException("Failed to lookup entities [PAPER=true]", e);
+            }
+        }
+        try {
+            //noinspection unchecked
+            return ((PersistentEntitySectionManager<Entity>) (SERVER_LEVEL_ENTITY_MANAGER.get(chunk.level))).getEntities(chunk.getPos());
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException("Failed to lookup entities [PAPER=false]", e);
+        }
+    }
+
+    record FakeIdMapBlock(int size) implements IdMap<net.minecraft.world.level.block.state.BlockState> {
+
+        @Override
+        public int getId(final net.minecraft.world.level.block.state.BlockState entry) {
+            return 0;
+        }
+
+        @Nullable
+        @Override
+        public net.minecraft.world.level.block.state.BlockState byId(final int index) {
+            return null;
+        }
+
+        @Nonnull
+        @Override
+        public Iterator<net.minecraft.world.level.block.state.BlockState> iterator() {
+            return Collections.emptyIterator();
+        }
+
+    }
+
+    record FakeIdMapBiome(int size) implements IdMap<Biome> {
+
+        @Override
+        public int getId(final Biome entry) {
+            return 0;
+        }
+
+        @Nullable
+        @Override
+        public Biome byId(final int index) {
+            return null;
+        }
+
+        @Nonnull
+        @Override
+        public Iterator<Biome> iterator() {
+            return Collections.emptyIterator();
+        }
+
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightPostProcessor.java

@@ -0,0 +1,175 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.configuration.Settings;
+import com.fastasyncworldedit.core.extent.processor.ProcessorScope;
+import com.fastasyncworldedit.core.queue.IBatchProcessor;
+import com.fastasyncworldedit.core.queue.IChunk;
+import com.fastasyncworldedit.core.queue.IChunkGet;
+import com.fastasyncworldedit.core.queue.IChunkSet;
+import com.fastasyncworldedit.core.registry.state.PropertyKey;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockTypes;
+import com.sk89q.worldedit.world.block.BlockTypesCache;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.material.Fluid;
+import net.minecraft.world.level.material.Fluids;
+
+import javax.annotation.Nullable;
+
+public class PaperweightPostProcessor implements IBatchProcessor {
+
+    @Override
+    public IChunkSet processSet(final IChunk chunk, final IChunkGet get, final IChunkSet set) {
+        return set;
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    public void postProcess(final IChunk chunk, final IChunkGet iChunkGet, final IChunkSet iChunkSet) {
+        boolean tickFluid = Settings.settings().EXPERIMENTAL.ALLOW_TICK_FLUIDS;
+        // The PostProcessor shouldn't be added, but just in case
+        if (!tickFluid) {
+            return;
+        }
+        PaperweightGetBlocks_Copy getBlocks = (PaperweightGetBlocks_Copy) iChunkGet;
+        layer:
+        for (int layer = iChunkSet.getMinSectionPosition(); layer <= iChunkSet.getMaxSectionPosition(); layer++) {
+            char[] set = iChunkSet.loadIfPresent(layer);
+            if (set == null) {
+                // No edit means no need to process
+                continue;
+            }
+            char[] get = null;
+            for (int i = 0; i < 4096; i++) {
+                char ordinal = set[i];
+                char replacedOrdinal = BlockTypesCache.ReservedIDs.__RESERVED__;
+                boolean fromGet = false; // Used for liquids
+                if (ordinal == BlockTypesCache.ReservedIDs.__RESERVED__) {
+                    if (get == null) {
+                        get = getBlocks.load(layer);
+                    }
+                    // If this is null, then it's because we're loading a layer in the range of 0->15, but blocks aren't
+                    // actually being set
+                    if (get == null) {
+                        continue layer;
+                    }
+                    fromGet = true;
+                    ordinal = replacedOrdinal = get[i];
+                }
+                if (ordinal == BlockTypesCache.ReservedIDs.__RESERVED__) {
+                    continue;
+                } else if (!fromGet) { // if fromGet, don't do the same again
+                    if (get == null) {
+                        get = getBlocks.load(layer);
+                    }
+                    replacedOrdinal = get[i];
+                }
+                boolean ticking = BlockTypesCache.ticking[ordinal];
+                boolean replacedWasTicking = BlockTypesCache.ticking[replacedOrdinal];
+                boolean replacedWasLiquid = false;
+                BlockState replacedState = null;
+                if (!ticking) {
+                    // If the block being replaced was not ticking, it cannot be a liquid
+                    if (!replacedWasTicking) {
+                        continue;
+                    }
+                    // If the block being replaced is not fluid, we do not need to worry
+                    if (!(replacedWasLiquid =
+                            (replacedState = BlockState.getFromOrdinal(replacedOrdinal)).getMaterial().isLiquid())) {
+                        continue;
+                    }
+                }
+                BlockState state = BlockState.getFromOrdinal(ordinal);
+                boolean liquid = state.getMaterial().isLiquid();
+                int x = i & 15;
+                int y = (i >> 8) & 15;
+                int z = (i >> 4) & 15;
+                BlockPos position = new BlockPos((chunk.getX() << 4) + x, (layer << 4) + y, (chunk.getZ() << 4) + z);
+                if (liquid || replacedWasLiquid) {
+                    if (liquid) {
+                        addFluid(getBlocks.serverLevel, state, position);
+                        continue;
+                    }
+                    // If the replaced fluid (is?) adjacent to water. Do not bother to check adjacent chunks(sections) as this
+                    // may be time consuming. Chances are any fluid blocks in adjacent chunks are being replaced or will end up
+                    // being ticked anyway. We only need it to be "hit" once.
+                    if (!wasAdjacentToWater(get, set, i, x, y, z)) {
+                        continue;
+                    }
+                    addFluid(getBlocks.serverLevel, replacedState, position);
+                }
+            }
+        }
+    }
+
+    @Nullable
+    @Override
+    public Extent construct(final Extent child) {
+        throw new UnsupportedOperationException("Processing only");
+    }
+
+    @Override
+    public ProcessorScope getScope() {
+        return ProcessorScope.READING_SET_BLOCKS;
+    }
+
+    private boolean wasAdjacentToWater(char[] get, char[] set, int i, int x, int y, int z) {
+        if (set == null || get == null) {
+            return false;
+        }
+        char ordinal;
+        char reserved = BlockTypesCache.ReservedIDs.__RESERVED__;
+        if (x > 0 && set[i - 1] != reserved) {
+            if (BlockTypesCache.ticking[(ordinal = get[i - 1])] && isFluid(ordinal)) {
+                return true;
+            }
+        }
+        if (x < 15 && set[i + 1] != reserved) {
+            if (BlockTypesCache.ticking[(ordinal = get[i + 1])] && isFluid(ordinal)) {
+                return true;
+            }
+        }
+        if (z > 0 && set[i - 16] != reserved) {
+            if (BlockTypesCache.ticking[(ordinal = get[i - 16])] && isFluid(ordinal)) {
+                return true;
+            }
+        }
+        if (z < 15 && set[i + 16] != reserved) {
+            if (BlockTypesCache.ticking[(ordinal = get[i + 16])] && isFluid(ordinal)) {
+                return true;
+            }
+        }
+        if (y > 0 && set[i - 256] != reserved) {
+            if (BlockTypesCache.ticking[(ordinal = get[i - 256])] && isFluid(ordinal)) {
+                return true;
+            }
+        }
+        if (y < 15 && set[i + 256] != reserved) {
+            return BlockTypesCache.ticking[(ordinal = get[i + 256])] && isFluid(ordinal);
+        }
+        return false;
+    }
+
+    @SuppressWarnings("deprecation")
+    private boolean isFluid(char ordinal) {
+        return BlockState.getFromOrdinal(ordinal).getMaterial().isLiquid();
+    }
+
+    @SuppressWarnings("deprecation")
+    private void addFluid(final ServerLevel serverLevel, final BlockState replacedState, final BlockPos position) {
+        Fluid type;
+        if (replacedState.getBlockType() == BlockTypes.LAVA) {
+            type = (int) replacedState.getState(PropertyKey.LEVEL) == 0 ? Fluids.LAVA : Fluids.FLOWING_LAVA;
+        } else {
+            type = (int) replacedState.getState(PropertyKey.LEVEL) == 0 ? Fluids.WATER : Fluids.FLOWING_WATER;
+        }
+        serverLevel.scheduleTick(
+                position,
+                type,
+                type.getTickDelay(serverLevel)
+        );
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightStarlightRelighter.java

@@ -0,0 +1,80 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.bukkit.adapter.StarlightRelighter;
+import com.fastasyncworldedit.core.configuration.Settings;
+import com.fastasyncworldedit.core.math.IntPair;
+import com.fastasyncworldedit.core.queue.IQueueExtent;
+import net.minecraft.server.level.ChunkMap;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.TicketType;
+import net.minecraft.util.Unit;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.chunk.status.ChunkPyramid;
+import net.minecraft.world.level.chunk.status.ChunkStatus;
+
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+import java.util.function.IntConsumer;
+
+public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLevel, ChunkPos> {
+
+    private static final TicketType<Unit> FAWE_TICKET = TicketType.create("fawe_ticket", (a, b) -> 0);
+    private static final int LIGHT_LEVEL = ChunkMap.MAX_VIEW_DISTANCE + ChunkPyramid.LOADING_PYRAMID
+            .getStepTo(ChunkStatus.FULL)
+            .getAccumulatedRadiusOf(ChunkStatus.LIGHT);
+
+    public PaperweightStarlightRelighter(ServerLevel serverLevel, IQueueExtent<?> queue) {
+        super(serverLevel, queue);
+    }
+
+    @Override
+    protected ChunkPos createChunkPos(final long chunkKey) {
+        return new ChunkPos(chunkKey);
+    }
+
+    @Override
+    protected long asLong(final int chunkX, final int chunkZ) {
+        return ChunkPos.asLong(chunkX, chunkZ);
+    }
+
+    @Override
+    protected CompletableFuture<?> chunkLoadFuture(final ChunkPos chunkPos) {
+        return serverLevel.getWorld().getChunkAtAsync(chunkPos.x, chunkPos.z)
+                .thenAccept(c -> serverLevel.getChunkSource().addTicketAtLevel(
+                        FAWE_TICKET,
+                        chunkPos,
+                        LIGHT_LEVEL,
+                        Unit.INSTANCE
+                ));
+    }
+
+    protected void invokeRelight(
+            Set<ChunkPos> coords,
+            Consumer<ChunkPos> chunkCallback,
+            IntConsumer processCallback
+    ) {
+        try {
+            serverLevel.getChunkSource().getLightEngine().starlight$serverRelightChunks(coords, chunkCallback, processCallback);
+        } catch (Exception e) {
+            LOGGER.error("Error occurred on relighting", e);
+        }
+    }
+
+    /*
+     * Allow the server to unload the chunks again.
+     * Also, if chunk packets are sent delayed, we need to do that here
+     */
+    protected void postProcessChunks(Set<ChunkPos> coords) {
+        boolean delay = Settings.settings().LIGHTING.DELAY_PACKET_SENDING;
+        for (ChunkPos pos : coords) {
+            int x = pos.x;
+            int z = pos.z;
+            if (delay) { // we still need to send the block changes of that chunk
+                PaperweightPlatformAdapter.sendChunk(new IntPair(x, z), serverLevel, x, z);
+            }
+            serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
+        }
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/PaperweightStarlightRelighterFactory.java

@@ -0,0 +1,25 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4;
+
+import com.fastasyncworldedit.core.extent.processor.lighting.NullRelighter;
+import com.fastasyncworldedit.core.extent.processor.lighting.RelightMode;
+import com.fastasyncworldedit.core.extent.processor.lighting.Relighter;
+import com.fastasyncworldedit.core.extent.processor.lighting.RelighterFactory;
+import com.fastasyncworldedit.core.queue.IQueueExtent;
+import com.sk89q.worldedit.world.World;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.CraftWorld;
+
+import javax.annotation.Nonnull;
+
+public class PaperweightStarlightRelighterFactory implements RelighterFactory {
+
+    @Override
+    public @Nonnull Relighter createRelighter(RelightMode relightMode, World world, IQueueExtent<?> queue) {
+        org.bukkit.World w = Bukkit.getWorld(world.getName());
+        if (w == null) {
+            return NullRelighter.INSTANCE;
+        }
+        return new PaperweightStarlightRelighter(((CraftWorld) w).getHandle(), queue);
+    }
+
+}

worldedit-bukkit/adapters/adapter-1_21_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_4/regen/PaperweightRegen.java

@@ -0,0 +1,298 @@
+package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_21_4.regen;
+
+import com.fastasyncworldedit.bukkit.adapter.Regenerator;
+import com.fastasyncworldedit.core.Fawe;
+import com.fastasyncworldedit.core.queue.IChunkCache;
+import com.fastasyncworldedit.core.queue.IChunkGet;
+import com.fastasyncworldedit.core.queue.implementation.chunk.ChunkCache;
+import com.google.common.collect.ImmutableList;
+import com.mojang.serialization.Lifecycle;
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.bukkit.WorldEditPlugin;
+import com.sk89q.worldedit.bukkit.adapter.Refraction;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.regions.Region;
+import com.sk89q.worldedit.util.io.file.SafeFiles;
+import com.sk89q.worldedit.world.RegenOptions;
+import net.minecraft.core.Holder;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.progress.ChunkProgressListener;
+import net.minecraft.util.ProgressListener;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.LevelSettings;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator;
+import net.minecraft.world.level.levelgen.WorldOptions;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import net.minecraft.world.level.storage.PrimaryLevelData;
+import org.bukkit.Bukkit;
+import org.bukkit.World;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.generator.BiomeProvider;
+
+import javax.annotation.Nonnull;
+import java.lang.reflect.Field;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.OptionalLong;
+import java.util.function.BooleanSupplier;
+import java.util.function.Supplier;
+
+import static net.minecraft.core.registries.Registries.BIOME;
+
+public class PaperweightRegen extends Regenerator {
+
+    private static final Field serverWorldsField;
+    private static final Field paperConfigField;
+    private static final Field generatorSettingBaseSupplierField;
+
+
+    static {
+        try {
+            serverWorldsField = CraftServer.class.getDeclaredField("worlds");
+            serverWorldsField.setAccessible(true);
+
+            Field tmpPaperConfigField;
+            try { //only present on paper
+                tmpPaperConfigField = Level.class.getDeclaredField("paperConfig");
+                tmpPaperConfigField.setAccessible(true);
+            } catch (Exception e) {
+                tmpPaperConfigField = null;
+            }
+            paperConfigField = tmpPaperConfigField;
+
+            generatorSettingBaseSupplierField = NoiseBasedChunkGenerator.class.getDeclaredField(Refraction.pickName(
+                    "settings", "e"));
+            generatorSettingBaseSupplierField.setAccessible(true);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    //runtime
+    private ServerLevel originalServerWorld;
+    private ServerLevel freshWorld;
+    private LevelStorageSource.LevelStorageAccess session;
+
+    private Path tempDir;
+
+    public PaperweightRegen(
+            World originalBukkitWorld,
+            Region region,
+            Extent target,
+            RegenOptions options
+    ) {
+        super(originalBukkitWorld, region, target, options);
+    }
+
+    @Override
+    protected void runTasks(final BooleanSupplier shouldKeepTicking) {
+        while (shouldKeepTicking.getAsBoolean()) {
+            if (!this.freshWorld.getChunkSource().pollTask()) {
+                return;
+            }
+        }
+    }
+
+    @Override
+    protected boolean prepare() {
+        this.originalServerWorld = ((CraftWorld) originalBukkitWorld).getHandle();
+        seed = options.getSeed().orElse(originalServerWorld.getSeed());
+        return true;
+    }
+
+    @Override
+    protected boolean initNewWorld() throws Exception {
+        //world folder
+        tempDir = java.nio.file.Files.createTempDirectory("FastAsyncWorldEditWorldGen");
+
+        //prepare for world init (see upstream implementation for reference)
+        org.bukkit.World.Environment environment = originalBukkitWorld.getEnvironment();
+        org.bukkit.generator.ChunkGenerator generator = originalBukkitWorld.getGenerator();
+        LevelStorageSource levelStorageSource = LevelStorageSource.createDefault(tempDir);
+        ResourceKey<LevelStem> levelStemResourceKey = getWorldDimKey(environment);
+        session = levelStorageSource.createAccess("faweregentempworld", levelStemResourceKey);
+        PrimaryLevelData originalWorldData = originalServerWorld.serverLevelData;
+
+        MinecraftServer server = originalServerWorld.getCraftServer().getServer();
+        WorldOptions originalOpts = originalWorldData.worldGenOptions();
+        WorldOptions newOpts = options.getSeed().isPresent()
+                ? originalOpts.withSeed(OptionalLong.of(seed))
+                : originalOpts;
+        LevelSettings newWorldSettings = new LevelSettings(
+                "faweregentempworld",
+                originalWorldData.settings.gameType(),
+                originalWorldData.settings.hardcore(),
+                originalWorldData.settings.difficulty(),
+                originalWorldData.settings.allowCommands(),
+                originalWorldData.settings.gameRules(),
+                originalWorldData.settings.getDataConfiguration()
+        );
+
+        PrimaryLevelData.SpecialWorldProperty specialWorldProperty =
+                originalWorldData.isFlatWorld()
+                        ? PrimaryLevelData.SpecialWorldProperty.FLAT
+                        : originalWorldData.isDebugWorld()
+                                ? PrimaryLevelData.SpecialWorldProperty.DEBUG
+                                : PrimaryLevelData.SpecialWorldProperty.NONE;
+        PrimaryLevelData newWorldData = new PrimaryLevelData(newWorldSettings, newOpts, specialWorldProperty, Lifecycle.stable());
+
+        BiomeProvider biomeProvider = getBiomeProvider();
+
+
+        //init world
+        freshWorld = Fawe.instance().getQueueHandler().sync((Supplier<ServerLevel>) () -> new ServerLevel(
+                server,
+                server.executor,
+                session,
+                newWorldData,
+                originalServerWorld.dimension(),
+                new LevelStem(
+                        originalServerWorld.dimensionTypeRegistration(),
+                        originalServerWorld.getChunkSource().getGenerator()
+                ),
+                new RegenNoOpWorldLoadListener(),
+                originalServerWorld.isDebug(),
+                seed,
+                ImmutableList.of(),
+                false,
+                originalServerWorld.getRandomSequences(),
+                environment,
+                generator,
+                biomeProvider
+        ) {
+
+            private final Holder<Biome> singleBiome = options.hasBiomeType() ? DedicatedServer.getServer().registryAccess()
+                    .lookupOrThrow(BIOME).asHolderIdMap().byIdOrThrow(
+                            WorldEditPlugin.getInstance().getBukkitImplAdapter().getInternalBiomeId(options.getBiomeType())
+                    ) : null;
+
+            @Override
+            public @Nonnull Holder<Biome> getUncachedNoiseBiome(int biomeX, int biomeY, int biomeZ) {
+                if (options.hasBiomeType()) {
+                    return singleBiome;
+                }
+                return super.getUncachedNoiseBiome(biomeX, biomeY, biomeZ);
+            }
+
+            @Override
+            public void save(
+                    final ProgressListener progressListener,
+                    final boolean flush,
+                    final boolean savingDisabled
+            ) {
+                // noop, spigot
+            }
+
+            @Override
+            public void save(
+                    final ProgressListener progressListener,
+                    final boolean flush,
+                    final boolean savingDisabled,
+                    final boolean close
+            ) {
+                // noop, paper
+            }
+        }).get();
+        freshWorld.noSave = true;
+        removeWorldFromWorldsMap();
+        newWorldData.checkName(originalServerWorld.serverLevelData.getLevelName()); //rename to original world name
+        if (paperConfigField != null) {
+            paperConfigField.set(freshWorld, originalServerWorld.paperConfig());
+        }
+        return true;
+    }
+
+    @Override
+    protected void cleanup() {
+        try {
+            session.close();
+        } catch (Exception ignored) {
+        }
+
+        //shutdown chunk provider
+        try {
+            Fawe.instance().getQueueHandler().sync(() -> {
+                try {
+                    freshWorld.getChunkSource().getDataStorage().cache.clear();
+                    freshWorld.getChunkSource().close(false);
+                } catch (Exception e) {
+                    throw new RuntimeException(e);
+                }
+            });
+        } catch (Exception ignored) {
+        }
+
+        //remove world from server
+        try {
+            Fawe.instance().getQueueHandler().sync(this::removeWorldFromWorldsMap);
+        } catch (Exception ignored) {
+        }
+
+        //delete directory
+        try {
+            SafeFiles.tryHardToDeleteDir(tempDir);
+        } catch (Exception ignored) {
+        }
+    }
+
+    @Override
+    protected IChunkCache<IChunkGet> initSourceQueueCache() {
+        return new ChunkCache<>(BukkitAdapter.adapt(freshWorld.getWorld()));
+    }
+
+    //util
+    @SuppressWarnings("unchecked")
+    private void removeWorldFromWorldsMap() {
+        try {
+            Map<String, org.bukkit.World> map = (Map<String, org.bukkit.World>) serverWorldsField.get(Bukkit.getServer());
+            map.remove("faweregentempworld");
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private ResourceKey<LevelStem> getWorldDimKey(org.bukkit.World.Environment env) {
+        return switch (env) {
+            case NETHER -> LevelStem.NETHER;
+            case THE_END -> LevelStem.END;
+            default -> LevelStem.OVERWORLD;
+        };
+    }
+
+    private static class RegenNoOpWorldLoadListener implements ChunkProgressListener {
+
+        private RegenNoOpWorldLoadListener() {
+        }
+
+        @Override
+        public void updateSpawnPos(@Nonnull ChunkPos spawnPos) {
+        }
+
+        @Override
+        public void onStatusChange(
+                final @Nonnull ChunkPos pos,
+                @org.jetbrains.annotations.Nullable final net.minecraft.world.level.chunk.status.ChunkStatus status
+        ) {
+
+        }
+
+        @Override
+        public void start() {
+
+        }
+
+        @Override
+        public void stop() {
+
+        }
+
+    }
+
+}

worldedit-bukkit/build.gradle.kts

@@ -252,7 +252,7 @@ publishMods {
     // We publish the reobfJar twice to ensure that the modrinth download menu picks the right jar for the platform regardless
     // of minecraft version.
 
-    val mojmapPaperVersions = listOf("1.20.6", "1.21.1", "1.21.3")
+    val mojmapPaperVersions = listOf("1.20.6", "1.21.1", "1.21.3", "1.21.4")
     val spigotMappedPaperVersions = listOf("1.20.2", "1.20.4")
 
     // Mark reobfJar as spigot only for 1.20.5+

worldedit-bukkit/src/main/resources/plugin.yml

@@ -2,7 +2,7 @@ name: FastAsyncWorldEdit
 main: com.sk89q.worldedit.bukkit.WorldEditPlugin
 version: "${internalVersion}"
 load: STARTUP
-api-version: 1.15
+api-version: 1.20
 softdepend: [ Vault ]
 provides: [ WorldEdit ]
 website: https://www.spigotmc.org/resources/13932/

worldedit-core/src/main/java/com/sk89q/worldedit/internal/Constants.java

@@ -94,4 +94,8 @@ public final class Constants {
      */
     public static final int DATA_VERSION_MC_1_21_3 = 4082;
 
+    /**
+     * The DataVersion for Minecraft 1.21.4
+     */
+    public static final int DATA_VERSION_MC_1_21_4 = 4189;
 }

worldedit-core/src/main/java/com/sk89q/worldedit/world/biome/BiomeTypes.java

@@ -179,6 +179,8 @@ public final class BiomeTypes {
     @Nullable
     public static final BiomeType OLD_GROWTH_SPRUCE_TAIGA = get("minecraft:old_growth_spruce_taiga");
     @Nullable
+    public static final BiomeType PALE_GARDEN = get("minecraft:pale_garden");
+    @Nullable
     public static final BiomeType PLAINS = get("minecraft:plains");
     @Nullable
     public static final BiomeType RIVER = get("minecraft:river");

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockCategories.java

@@ -45,6 +45,7 @@ public final class BlockCategories {
     public static final BlockCategory BASE_STONE_OVERWORLD = get("minecraft:base_stone_overworld");
     public static final BlockCategory BEACON_BASE_BLOCKS = get("minecraft:beacon_base_blocks");
     public static final BlockCategory BEDS = get("minecraft:beds");
+    public static final BlockCategory BEE_ATTRACTIVE = get("minecraft:bee_attractive");
     public static final BlockCategory BEE_GROWABLES = get("minecraft:bee_growables");
     public static final BlockCategory BEEHIVES = get("minecraft:beehives");
     public static final BlockCategory BIG_DRIPLEAF_PLACEABLE = get("minecraft:big_dripleaf_placeable");
@@ -146,6 +147,7 @@ public final class BlockCategories {
     public static final BlockCategory OCCLUDES_VIBRATION_SIGNALS = get("minecraft:occludes_vibration_signals");
     public static final BlockCategory OVERWORLD_CARVER_REPLACEABLES = get("minecraft:overworld_carver_replaceables");
     public static final BlockCategory OVERWORLD_NATURAL_LOGS = get("minecraft:overworld_natural_logs");
+    public static final BlockCategory PALE_OAK_LOGS = get("minecraft:pale_oak_logs");
     public static final BlockCategory PARROTS_SPAWNABLE_ON = get("minecraft:parrots_spawnable_on");
     public static final BlockCategory PIGLIN_REPELLENTS = get("minecraft:piglin_repellents");
     public static final BlockCategory PLANKS = get("minecraft:planks");
@@ -186,7 +188,7 @@ public final class BlockCategories {
     public static final BlockCategory STONE_PRESSURE_PLATES = get("minecraft:stone_pressure_plates");
     public static final BlockCategory STRIDER_WARM_BLOCKS = get("minecraft:strider_warm_blocks");
     public static final BlockCategory SWORD_EFFICIENT = get("minecraft:sword_efficient");
-    public static final BlockCategory TALL_FLOWERS = get("minecraft:tall_flowers");
+    @Deprecated public static final BlockCategory TALL_FLOWERS = get("minecraft:tall_flowers");
     public static final BlockCategory TERRACOTTA = get("minecraft:terracotta");
     public static final BlockCategory TRAIL_RUINS_REPLACEABLE = get("minecraft:trail_ruins_replaceable");
     public static final BlockCategory TRAPDOORS = get("minecraft:trapdoors");

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockTypes.java

@@ -427,6 +427,8 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType CHISELED_RED_SANDSTONE = init();
     @Nullable
+    public static final BlockType CHISELED_RESIN_BRICKS = init();
+    @Nullable
     public static final BlockType CHISELED_SANDSTONE = init();
     @Nullable
     public static final BlockType CHISELED_STONE_BRICKS = init();
@@ -441,6 +443,8 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType CLAY = init();
     @Nullable
+    public static final BlockType CLOSED_EYEBLOSSOM = init();
+    @Nullable
     public static final BlockType COAL_BLOCK = init();
     @Nullable
     public static final BlockType COAL_ORE = init();
@@ -1294,6 +1298,8 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType OCHRE_FROGLIGHT = init();
     @Nullable
+    public static final BlockType OPEN_EYEBLOSSOM = init();
+    @Nullable
     public static final BlockType ORANGE_BANNER = init();
     @Nullable
     public static final BlockType ORANGE_BED = init();
@@ -1489,6 +1495,8 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType POTTED_CHERRY_SAPLING = init();
     @Nullable
+    public static final BlockType POTTED_CLOSED_EYEBLOSSOM = init();
+    @Nullable
     public static final BlockType POTTED_CORNFLOWER = init();
     @Nullable
     public static final BlockType POTTED_CRIMSON_FUNGUS = init();
@@ -1516,6 +1524,8 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType POTTED_OAK_SAPLING = init();
     @Nullable
+    public static final BlockType POTTED_OPEN_EYEBLOSSOM = init();
+    @Nullable
     public static final BlockType POTTED_ORANGE_TULIP = init();
     @Nullable
     public static final BlockType POTTED_OXEYE_DAISY = init();
@@ -1688,6 +1698,18 @@ public final class BlockTypes {
     @Nullable
     public static final BlockType REPEATING_COMMAND_BLOCK = init();
     @Nullable
+    public static final BlockType RESIN_BLOCK = init();
+    @Nullable
+    public static final BlockType RESIN_BRICK_SLAB = init();
+    @Nullable
+    public static final BlockType RESIN_BRICK_STAIRS = init();
+    @Nullable
+    public static final BlockType RESIN_BRICK_WALL = init();
+    @Nullable
+    public static final BlockType RESIN_BRICKS = init();
+    @Nullable
+    public static final BlockType RESIN_CLUMP = init();
+    @Nullable
     public static final BlockType RESPAWN_ANCHOR = init();
     @Nullable
     public static final BlockType ROOTED_DIRT = init();

worldedit-core/src/main/java/com/sk89q/worldedit/world/entity/EntityTypes.java

@@ -77,6 +77,10 @@ public final class EntityTypes {
     @Nullable
     public static final EntityType COW = get("minecraft:cow");
     @Nullable
+    public static final EntityType CREAKING = get("minecraft:creaking");
+    @Deprecated @Nullable
+    public static final EntityType CREAKING_TRANSIENT = get("minecraft:creaking_transient");
+    @Nullable
     public static final EntityType CREEPER = get("minecraft:creeper");
     @Nullable
     public static final EntityType DOLPHIN = get("minecraft:dolphin");

worldedit-core/src/main/java/com/sk89q/worldedit/world/item/ItemCategories.java

@@ -69,6 +69,7 @@ public final class ItemCategories {
     public static final ItemCategory DIAMOND_ORES = get("minecraft:diamond_ores");
     public static final ItemCategory DIRT = get("minecraft:dirt");
     public static final ItemCategory DOORS = get("minecraft:doors");
+    public static final ItemCategory DROWNED_PREFERRED_WEAPONS = get("minecraft:drowned_preferred_weapons");
     public static final ItemCategory DYEABLE = get("minecraft:dyeable");
     public static final ItemCategory EMERALD_ORES = get("minecraft:emerald_ores");
     public static final ItemCategory ENCHANTABLE_ARMOR = get("minecraft:enchantable/armor");
@@ -92,7 +93,7 @@ public final class ItemCategories {
     public static final ItemCategory FENCE_GATES = get("minecraft:fence_gates");
     public static final ItemCategory FENCES = get("minecraft:fences");
     public static final ItemCategory FISHES = get("minecraft:fishes");
-    public static final ItemCategory FLOWERS = get("minecraft:flowers");
+    @Deprecated public static final ItemCategory FLOWERS = get("minecraft:flowers");
     public static final ItemCategory FOOT_ARMOR = get("minecraft:foot_armor");
     public static final ItemCategory FOX_FOOD = get("minecraft:fox_food");
     public static final ItemCategory FREEZE_IMMUNE_WEARABLES = get("minecraft:freeze_immune_wearables");
@@ -127,6 +128,7 @@ public final class ItemCategories {
     @Deprecated public static final ItemCategory OCCLUDES_VIBRATION_SIGNALS = get("minecraft:occludes_vibration_signals");
     public static final ItemCategory OCELOT_FOOD = get("minecraft:ocelot_food");
     @Deprecated public static final ItemCategory OVERWORLD_NATURAL_LOGS = get("minecraft:overworld_natural_logs");
+    public static final ItemCategory PALE_OAK_LOGS = get("minecraft:pale_oak_logs");
     public static final ItemCategory PANDA_FOOD = get("minecraft:panda_food");
     public static final ItemCategory PARROT_FOOD = get("minecraft:parrot_food");
     public static final ItemCategory PARROT_POISONOUS_FOOD = get("minecraft:parrot_poisonous_food");
@@ -134,7 +136,10 @@ public final class ItemCategories {
     public static final ItemCategory PIG_FOOD = get("minecraft:pig_food");
     public static final ItemCategory PIGLIN_FOOD = get("minecraft:piglin_food");
     public static final ItemCategory PIGLIN_LOVED = get("minecraft:piglin_loved");
+    public static final ItemCategory PIGLIN_PREFERRED_WEAPONS = get("minecraft:piglin_preferred_weapons");
     public static final ItemCategory PIGLIN_REPELLENTS = get("minecraft:piglin_repellents");
+    public static final ItemCategory PIGLIN_SAFE_ARMOR = get("minecraft:piglin_safe_armor");
+    public static final ItemCategory PILLAGER_PREFERRED_WEAPONS = get("minecraft:pillager_preferred_weapons");
     public static final ItemCategory PLANKS = get("minecraft:planks");
     public static final ItemCategory RABBIT_FOOD = get("minecraft:rabbit_food");
     public static final ItemCategory RAILS = get("minecraft:rails");
@@ -144,6 +149,7 @@ public final class ItemCategories {
     public static final ItemCategory SHEEP_FOOD = get("minecraft:sheep_food");
     public static final ItemCategory SHOVELS = get("minecraft:shovels");
     public static final ItemCategory SIGNS = get("minecraft:signs");
+    public static final ItemCategory SKELETON_PREFERRED_WEAPONS = get("minecraft:skeleton_preferred_weapons");
     public static final ItemCategory SKULLS = get("minecraft:skulls");
     public static final ItemCategory SLABS = get("minecraft:slabs");
     public static final ItemCategory SMALL_FLOWERS = get("minecraft:small_flowers");
@@ -159,12 +165,12 @@ public final class ItemCategories {
     public static final ItemCategory STRIDER_FOOD = get("minecraft:strider_food");
     public static final ItemCategory STRIDER_TEMPT_ITEMS = get("minecraft:strider_tempt_items");
     public static final ItemCategory SWORDS = get("minecraft:swords");
-    public static final ItemCategory TALL_FLOWERS = get("minecraft:tall_flowers");
+    @Deprecated public static final ItemCategory TALL_FLOWERS = get("minecraft:tall_flowers");
     public static final ItemCategory TERRACOTTA = get("minecraft:terracotta");
     @Deprecated public static final ItemCategory TOOLS = get("minecraft:tools");
     public static final ItemCategory TRAPDOORS = get("minecraft:trapdoors");
     public static final ItemCategory TRIM_MATERIALS = get("minecraft:trim_materials");
-    public static final ItemCategory TRIM_TEMPLATES = get("minecraft:trim_templates");
+    @Deprecated public static final ItemCategory TRIM_TEMPLATES = get("minecraft:trim_templates");
     public static final ItemCategory TRIMMABLE_ARMOR = get("minecraft:trimmable_armor");
     public static final ItemCategory TURTLE_FOOD = get("minecraft:turtle_food");
     public static final ItemCategory VILLAGER_PLANTABLE_SEEDS = get("minecraft:villager_plantable_seeds");

worldedit-core/src/main/java/com/sk89q/worldedit/world/item/ItemTypes.java

@@ -492,6 +492,8 @@ public final class ItemTypes {
     @Nullable
     public static final ItemType CHISELED_RED_SANDSTONE = init();
     @Nullable
+    public static final ItemType CHISELED_RESIN_BRICKS = init();
+    @Nullable
     public static final ItemType CHISELED_SANDSTONE = init();
     @Nullable
     public static final ItemType CHISELED_STONE_BRICKS = init();
@@ -512,6 +514,8 @@ public final class ItemTypes {
     @Nullable
     public static final ItemType CLOCK = init();
     @Nullable
+    public static final ItemType CLOSED_EYEBLOSSOM = init();
+    @Nullable
     public static final ItemType COAL = init();
     @Nullable
     public static final ItemType COAL_BLOCK = init();
@@ -1696,6 +1700,8 @@ public final class ItemTypes {
     @Nullable
     public static final ItemType OMINOUS_TRIAL_KEY = init();
     @Nullable
+    public static final ItemType OPEN_EYEBLOSSOM = init();
+    @Nullable
     public static final ItemType ORANGE_BANNER = init();
     @Nullable
     public static final ItemType ORANGE_BED = init();
@@ -2070,6 +2076,20 @@ public final class ItemTypes {
     @Nullable
     public static final ItemType REPEATING_COMMAND_BLOCK = init();
     @Nullable
+    public static final ItemType RESIN_BLOCK = init();
+    @Nullable
+    public static final ItemType RESIN_BRICK = init();
+    @Nullable
+    public static final ItemType RESIN_BRICK_SLAB = init();
+    @Nullable
+    public static final ItemType RESIN_BRICK_STAIRS = init();
+    @Nullable
+    public static final ItemType RESIN_BRICK_WALL = init();
+    @Nullable
+    public static final ItemType RESIN_BRICKS = init();
+    @Nullable
+    public static final ItemType RESIN_CLUMP = init();
+    @Nullable
     public static final ItemType RESPAWN_ANCHOR = init();
     @Nullable
     public static final ItemType RIB_ARMOR_TRIM_SMITHING_TEMPLATE = init();

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BundledRegistries.java

@@ -46,6 +46,7 @@ public class BundledRegistries implements Registries {
         versionMap.put(Range.atLeast(Constants.DATA_VERSION_MC_1_20), "120");
         versionMap.put(Range.atLeast(Constants.DATA_VERSION_MC_1_21), "121");
         versionMap.put(Range.atLeast(Constants.DATA_VERSION_MC_1_21_3), "1213");
+        versionMap.put(Range.atLeast(Constants.DATA_VERSION_MC_1_21_4), "1214");
         VERSION_MAP = ImmutableRangeMap.copyOf(versionMap);
     }