refactor: adjust chunk sending (#2770)

- synchronise on the chunk GET object (when available)
 - kick it off to be run at some point on the main server thread

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightFaweWorldNativeAccess.java

@@ -246,7 +246,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                     return;
                 }
                 for (IntPair chunk : toSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };
@@ -262,7 +262,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                         sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
                 ));
                 for (IntPair chunk : cachedChunksToSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightGetBlocks.java

@@ -823,7 +823,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
                         nmsChunk.setUnsaved(true);
                         // send to player
                         if (Settings.settings().LIGHTING.MODE == 0 || !Settings.settings().LIGHTING.DELAY_PACKET_SENDING) {
-                            this.send(finalMask, finalLightUpdate);
+                            this.send();
                         }
                         if (finalizer != null) {
                             finalizer.run();
@@ -919,9 +919,9 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     }
 
     @Override
-    public void send(int mask, boolean lighting) {
+    public void send() {
         synchronized (sendLock) {
-            PaperweightPlatformAdapter.sendChunk(serverLevel, chunkX, chunkZ, lighting);
+            PaperweightPlatformAdapter.sendChunk(this, serverLevel, chunkX, chunkZ);
         }
     }
 

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightPlatformAdapter.java

@@ -26,6 +26,7 @@ import net.minecraft.core.Holder;
 import net.minecraft.core.IdMap;
 import net.minecraft.core.Registry;
 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;
@@ -318,7 +319,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
     }
 
     @SuppressWarnings("deprecation")
-    public static void sendChunk(ServerLevel nmsWorld, int chunkX, int chunkZ, boolean lighting) {
+    public static void sendChunk(Object chunk, ServerLevel nmsWorld, int chunkX, int chunkZ) {
         ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
         if (chunkHolder == null) {
             return;
@@ -339,9 +340,10 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
         if (levelChunk == null) {
             return;
         }
-        TaskManager.taskManager().task(() -> {
+        MinecraftServer.getServer().execute(() -> {
             ClientboundLevelChunkWithLightPacket packet;
             if (PaperLib.isPaper()) {
+                synchronized (chunk) {
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
                             nmsWorld.getChunkSource().getLightEngine(),
@@ -350,7 +352,9 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             true,
                             false // last false is to not bother with x-ray
                     );
+                }
             } else {
+                synchronized (chunk) {
                     // deprecated on paper - deprecation suppressed
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
@@ -360,6 +364,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             true
                     );
                 }
+            }
             nearbyPlayers(nmsWorld, coordIntPair).forEach(p -> p.connection.send(packet));
         });
     }

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightStarlightRelighter.java

@@ -67,7 +67,7 @@ public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLeve
             int x = pos.x;
             int z = pos.z;
             if (delay) { // we still need to send the block changes of that chunk
-                PaperweightPlatformAdapter.sendChunk(serverLevel, x, z, false);
+                PaperweightPlatformAdapter.sendChunk(pos, serverLevel, x, z);
             }
             serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
         }

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightFaweWorldNativeAccess.java

@@ -247,7 +247,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                     return;
                 }
                 for (IntPair chunk : toSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };
@@ -263,7 +263,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                         sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
                 ));
                 for (IntPair chunk : cachedChunksToSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightGetBlocks.java

@@ -821,7 +821,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
                         nmsChunk.setUnsaved(true);
                         // send to player
                         if (Settings.settings().LIGHTING.MODE == 0 || !Settings.settings().LIGHTING.DELAY_PACKET_SENDING) {
-                            this.send(finalMask, finalLightUpdate);
+                            this.send();
                         }
                         if (finalizer != null) {
                             finalizer.run();
@@ -917,9 +917,9 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     }
 
     @Override
-    public void send(int mask, boolean lighting) {
+    public void send() {
         synchronized (sendLock) {
-            PaperweightPlatformAdapter.sendChunk(serverLevel, chunkX, chunkZ, lighting);
+            PaperweightPlatformAdapter.sendChunk(this, serverLevel, chunkX, chunkZ);
         }
     }
 

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightPlatformAdapter.java

@@ -26,6 +26,7 @@ import net.minecraft.core.Holder;
 import net.minecraft.core.IdMap;
 import net.minecraft.core.Registry;
 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;
@@ -342,7 +343,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
     }
 
     @SuppressWarnings("deprecation")
-    public static void sendChunk(ServerLevel nmsWorld, int chunkX, int chunkZ, boolean lighting) {
+    public static void sendChunk(Object chunk, ServerLevel nmsWorld, int chunkX, int chunkZ) {
         ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
         if (chunkHolder == null) {
             return;
@@ -363,17 +364,20 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
         if (levelChunk == null) {
             return;
         }
-        TaskManager.taskManager().task(() -> {
+        MinecraftServer.getServer().execute(() -> {
             ClientboundLevelChunkWithLightPacket packet;
             if (PaperLib.isPaper()) {
+                synchronized (chunk) {
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
                             nmsWorld.getChunkSource().getLightEngine(),
                             null,
-                        null
+                            null,
-                        // last false is to not bother with x-ray
+                            false // last false is to not bother with x-ray
                     );
+                }
             } else {
+                synchronized (chunk) {
                     // deprecated on paper - deprecation suppressed
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
@@ -382,6 +386,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             null
                     );
                 }
+            }
             nearbyPlayers(nmsWorld, coordIntPair).forEach(p -> p.connection.send(packet));
         });
     }

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightStarlightRelighter.java

@@ -67,7 +67,7 @@ public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLeve
             int x = pos.x;
             int z = pos.z;
             if (delay) { // we still need to send the block changes of that chunk
-                PaperweightPlatformAdapter.sendChunk(serverLevel, x, z, false);
+                PaperweightPlatformAdapter.sendChunk(pos, serverLevel, x, z);
             }
             serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
         }

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightFaweWorldNativeAccess.java

@@ -247,7 +247,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                     return;
                 }
                 for (IntPair chunk : toSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };
@@ -263,7 +263,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                         sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
                 ));
                 for (IntPair chunk : cachedChunksToSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightGetBlocks.java

@@ -808,7 +808,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
                         nmsChunk.setUnsaved(true);
                         // send to player
                         if (Settings.settings().LIGHTING.MODE == 0 || !Settings.settings().LIGHTING.DELAY_PACKET_SENDING) {
-                            this.send(finalMask, finalLightUpdate);
+                            this.send();
                         }
                         if (finalizer != null) {
                             finalizer.run();
@@ -904,9 +904,9 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     }
 
     @Override
-    public void send(int mask, boolean lighting) {
+    public void send() {
         synchronized (sendLock) {
-            PaperweightPlatformAdapter.sendChunk(serverLevel, chunkX, chunkZ, lighting);
+            PaperweightPlatformAdapter.sendChunk(this, serverLevel, chunkX, chunkZ);
         }
     }
 

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightPlatformAdapter.java

@@ -26,6 +26,7 @@ import net.minecraft.core.Holder;
 import net.minecraft.core.IdMap;
 import net.minecraft.core.Registry;
 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;
@@ -333,7 +334,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
     }
 
     @SuppressWarnings("deprecation")
-    public static void sendChunk(ServerLevel nmsWorld, int chunkX, int chunkZ, boolean lighting) {
+    public static void sendChunk(Object chunk, ServerLevel nmsWorld, int chunkX, int chunkZ) {
         ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
         if (chunkHolder == null) {
             return;
@@ -354,17 +355,20 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
         if (levelChunk == null) {
             return;
         }
-        TaskManager.taskManager().task(() -> {
+        MinecraftServer.getServer().execute(() -> {
             ClientboundLevelChunkWithLightPacket packet;
             if (PaperLib.isPaper()) {
+                synchronized (chunk) {
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
                             nmsWorld.getChunkSource().getLightEngine(),
                             null,
-                        null
+                            null,
-                        // last false is to not bother with x-ray
+                            false // last false is to not bother with x-ray
                     );
+                }
             } else {
+                synchronized (chunk) {
                     // deprecated on paper - deprecation suppressed
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
@@ -373,6 +377,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             null
                     );
                 }
+            }
             nearbyPlayers(nmsWorld, coordIntPair).forEach(p -> p.connection.send(packet));
         });
     }

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightStarlightRelighter.java

@@ -67,7 +67,7 @@ public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLeve
             int x = pos.x;
             int z = pos.z;
             if (delay) { // we still need to send the block changes of that chunk
-                PaperweightPlatformAdapter.sendChunk(serverLevel, x, z, false);
+                PaperweightPlatformAdapter.sendChunk(pos, serverLevel, x, z);
             }
             serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
         }

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightFaweWorldNativeAccess.java

@@ -246,7 +246,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                     return;
                 }
                 for (IntPair chunk : toSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };
@@ -262,7 +262,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                         sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
                 ));
                 for (IntPair chunk : cachedChunksToSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightGetBlocks.java

@@ -87,7 +87,6 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     private final Registry<Biome> biomeRegistry;
     private final IdMap<Holder<Biome>> biomeHolderIdMap;
     private final ConcurrentHashMap<Integer, PaperweightGetBlocks_Copy> copies = new ConcurrentHashMap<>();
-    private final Object sendLock = new Object();
     private LevelChunkSection[] sections;
     private LevelChunk levelChunk;
     private DataLayer[] blockLight;
@@ -808,7 +807,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
                         nmsChunk.setUnsaved(true);
                         // send to player
                         if (Settings.settings().LIGHTING.MODE == 0 || !Settings.settings().LIGHTING.DELAY_PACKET_SENDING) {
-                            this.send(finalMask, finalLightUpdate);
+                            this.send();
                         }
                         if (finalizer != null) {
                             finalizer.run();
@@ -904,10 +903,8 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     }
 
     @Override
-    public void send(int mask, boolean lighting) {
+    public void send() {
-        synchronized (sendLock) {
+        PaperweightPlatformAdapter.sendChunk(this, serverLevel, chunkX, chunkZ);
-            PaperweightPlatformAdapter.sendChunk(serverLevel, chunkX, chunkZ, lighting);
-        }
     }
 
     /**

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightPlatformAdapter.java

@@ -26,6 +26,7 @@ import net.minecraft.core.Holder;
 import net.minecraft.core.IdMap;
 import net.minecraft.core.Registry;
 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;
@@ -332,7 +333,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
     }
 
     @SuppressWarnings("deprecation")
-    public static void sendChunk(ServerLevel nmsWorld, int chunkX, int chunkZ, boolean lighting) {
+    public static void sendChunk(Object chunk, ServerLevel nmsWorld, int chunkX, int chunkZ) {
         ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
         if (chunkHolder == null) {
             return;
@@ -353,17 +354,20 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
         if (levelChunk == null) {
             return;
         }
-        TaskManager.taskManager().task(() -> {
+        MinecraftServer.getServer().execute(() -> {
             ClientboundLevelChunkWithLightPacket packet;
             if (PaperLib.isPaper()) {
+                synchronized (chunk) {
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
                             nmsWorld.getChunkSource().getLightEngine(),
                             null,
-                        null
+                            null,
-                        // last false is to not bother with x-ray
+                            false // last false is to not bother with x-ray
                     );
+                }
             } else {
+                synchronized (chunk) {
                     // deprecated on paper - deprecation suppressed
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
@@ -372,6 +376,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             null
                     );
                 }
+            }
             nearbyPlayers(nmsWorld, coordIntPair).forEach(p -> p.connection.send(packet));
         });
     }

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightStarlightRelighter.java

@@ -67,7 +67,7 @@ public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLeve
             int x = pos.x;
             int z = pos.z;
             if (delay) { // we still need to send the block changes of that chunk
-                PaperweightPlatformAdapter.sendChunk(serverLevel, x, z, false);
+                PaperweightPlatformAdapter.sendChunk(pos, serverLevel, x, z);
             }
             serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
         }

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightFaweWorldNativeAccess.java

@@ -247,7 +247,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                     return;
                 }
                 for (IntPair chunk : toSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };
@@ -263,7 +263,7 @@ public class PaperweightFaweWorldNativeAccess implements WorldNativeAccess<Level
                         sideEffectSet != null && sideEffectSet.shouldApply(SideEffect.UPDATE)
                 ));
                 for (IntPair chunk : cachedChunksToSend) {
-                    PaperweightPlatformAdapter.sendChunk(getLevel().getWorld().getHandle(), chunk.x(), chunk.z(), false);
+                    PaperweightPlatformAdapter.sendChunk(chunk, getLevel().getWorld().getHandle(), chunk.x(), chunk.z());
                 }
             }
         };

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightGetBlocks.java

@@ -810,7 +810,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
                         nmsChunk.setUnsaved(true);
                         // send to player
                         if (Settings.settings().LIGHTING.MODE == 0 || !Settings.settings().LIGHTING.DELAY_PACKET_SENDING) {
-                            this.send(finalMask, finalLightUpdate);
+                            this.send();
                         }
                         if (finalizer != null) {
                             finalizer.run();
@@ -906,9 +906,9 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
     }
 
     @Override
-    public void send(int mask, boolean lighting) {
+    public void send() {
         synchronized (sendLock) {
-            PaperweightPlatformAdapter.sendChunk(serverLevel, chunkX, chunkZ, lighting);
+            PaperweightPlatformAdapter.sendChunk(this, serverLevel, chunkX, chunkZ);
         }
     }
 

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightPlatformAdapter.java

@@ -26,6 +26,7 @@ import net.minecraft.core.Holder;
 import net.minecraft.core.IdMap;
 import net.minecraft.core.Registry;
 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;
@@ -332,7 +333,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
     }
 
     @SuppressWarnings("deprecation")
-    public static void sendChunk(ServerLevel nmsWorld, int chunkX, int chunkZ, boolean lighting) {
+    public static void sendChunk(Object chunk, ServerLevel nmsWorld, int chunkX, int chunkZ) {
         ChunkHolder chunkHolder = getPlayerChunk(nmsWorld, chunkX, chunkZ);
         if (chunkHolder == null) {
             return;
@@ -351,17 +352,20 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
         if (levelChunk == null) {
             return;
         }
-        TaskManager.taskManager().task(() -> {
+        MinecraftServer.getServer().execute(() -> {
             ClientboundLevelChunkWithLightPacket packet;
             if (PaperLib.isPaper()) {
+                synchronized (chunk) {
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
                             nmsWorld.getChunkSource().getLightEngine(),
                             null,
-                        null
+                            null,
-                        // last false is to not bother with x-ray
+                            false // last false is to not bother with x-ray
                     );
+                }
             } else {
+                synchronized (chunk) {
                     // deprecated on paper - deprecation suppressed
                     packet = new ClientboundLevelChunkWithLightPacket(
                             levelChunk,
@@ -370,6 +374,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
                             null
                     );
                 }
+            }
             nearbyPlayers(nmsWorld, coordIntPair).forEach(p -> p.connection.send(packet));
         });
     }

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightStarlightRelighter.java

@@ -67,7 +67,7 @@ public class PaperweightStarlightRelighter extends StarlightRelighter<ServerLeve
             int x = pos.x;
             int z = pos.z;
             if (delay) { // we still need to send the block changes of that chunk
-                PaperweightPlatformAdapter.sendChunk(serverLevel, x, z, false);
+                PaperweightPlatformAdapter.sendChunk(pos, serverLevel, x, z);
             }
             serverLevel.getChunkSource().removeTicketAtLevel(FAWE_TICKET, pos, LIGHT_LEVEL, Unit.INSTANCE);
         }

worldedit-bukkit/src/main/java/com/fastasyncworldedit/bukkit/adapter/BukkitGetBlocks.java

@@ -2,6 +2,6 @@ package com.fastasyncworldedit.bukkit.adapter;
 
 public interface BukkitGetBlocks {
 
-    void send(int mask, boolean lighting);
+    void send();
 
 }

worldedit-bukkit/src/main/java/com/fastasyncworldedit/bukkit/adapter/NMSAdapter.java

@@ -137,7 +137,7 @@ public class NMSAdapter implements FAWEPlatformAdapterImpl {
         if (!(chunk instanceof BukkitGetBlocks)) {
             throw new IllegalArgumentException("(IChunkGet) chunk not of type BukkitGetBlocks");
         }
-        ((BukkitGetBlocks) chunk).send(mask, lighting);
+        ((BukkitGetBlocks) chunk).send();
     }
 
 }