Clear cached chunk packets after block commands

Fixes invisible blocks issue when SetBlockCommand, FillCommand, or
CloneCommands modify chunks that aren't being watched by any player.
The cached chunk packet is now invalidated so players receive fresh
chunk data when they teleport to the affected area.

Author: UnlimitedBytes

shreddedpaper-server/minecraft-patches/sources/net/minecraft/server/commands/CloneCommands.java.patch

@@ -32,6 +32,22 @@
                          }
                      }
 
+@@ -329,6 +_,15 @@
+                     }
+ 
+                     serverLevel1.getBlockTicks().copyAreaFrom(serverLevel.getBlockTicks(), boundingBox, blockPos4);
++
++                    // ShreddedPaper start - clear cached chunk packets for destination chunks
++                    for (int chunkX = boundingBox1.minX() >> 4; chunkX <= boundingBox1.maxX() >> 4; chunkX++) {
++                        for (int chunkZ = boundingBox1.minZ() >> 4; chunkZ <= boundingBox1.maxZ() >> 4; chunkZ++) {
++                            net.minecraft.world.level.chunk.LevelChunk chunk = serverLevel1.getChunkIfLoaded(chunkX, chunkZ);
++                            if (chunk != null) chunk.cachedChunkPacket = null;
++                        }
++                    }
++                    // ShreddedPaper end - clear cached chunk packets for destination chunks
+                 } catch (Throwable var35) {
+                     try {
+                         scopedCollector.close();
 @@ -336,17 +_,19 @@
                          var35.addSuppressed(var34);
                      }

shreddedpaper-server/minecraft-patches/sources/net/minecraft/server/commands/FillCommand.java.patch

@@ -55,12 +55,21 @@
                          }
                      }
                  }
-@@ -223,13 +_,15 @@
+@@ -223,13 +_,24 @@
                      level.updateNeighboursOnBlockSet(updatedPosition.pos, updatedPosition.oldState);
                  }
 
 -                if (i2 == 0) {
 -                    throw ERROR_FAILED.create();
++                // ShreddedPaper start - clear cached chunk packets for affected chunks
++                for (int chunkX = box.minX() >> 4; chunkX <= box.maxX() >> 4; chunkX++) {
++                    for (int chunkZ = box.minZ() >> 4; chunkZ <= box.maxZ() >> 4; chunkZ++) {
++                        net.minecraft.world.level.chunk.LevelChunk chunk = level.getChunkIfLoaded(chunkX, chunkZ);
++                        if (chunk != null) chunk.cachedChunkPacket = null;
++                    }
++                }
++                // ShreddedPaper end - clear cached chunk packets for affected chunks
++
 +                if (counter[0] == 0) {
 +                    source.sendFailure(Component.translatable("commands.fill.failed")); // ShreddedPaper - send failure message instead of throwing
                  } else {

shreddedpaper-server/minecraft-patches/sources/net/minecraft/server/commands/SetBlockCommand.java.patch

@@ -17,7 +17,7 @@
              boolean flag;
              if (mode == SetBlockCommand.Mode.DESTROY) {
                  level.destroyBlock(pos, true);
-@@ -117,15 +_,17 @@
+@@ -117,15 +_,22 @@
              BlockState blockState = level.getBlockState(pos);
              if (flag
                  && !block.place(level, pos, Block.UPDATE_CLIENTS | (strict ? Block.UPDATE_SKIP_ALL_SIDEEFFECTS : Block.UPDATE_SKIP_BLOCK_ENTITY_SIDEEFFECTS))) {
@@ -28,6 +28,11 @@
                      level.updateNeighboursOnBlockSet(pos, blockState);
                  }
 
++                // ShreddedPaper start - clear cached chunk packet
++                net.minecraft.world.level.chunk.LevelChunk chunk = level.getChunkIfLoaded(pos.getX() >> 4, pos.getZ() >> 4);
++                if (chunk != null) chunk.cachedChunkPacket = null;
++                // ShreddedPaper end - clear cached chunk packet
++
                  source.sendSuccess(() -> Component.translatable("commands.setblock.success", pos.getX(), pos.getY(), pos.getZ()), true);
 -                return 1;
              }