fix: последствия merge, не отловленные при тестировании(!)

anvil-loader/src/main/java/mc/world/anvil/AnvilBlock.java

@@ -62,8 +62,10 @@ public class AnvilBlock implements Block {
                 (chunkSection.getParent().getZ() << 4) + location.getZ()
         );
 
-        compoundTag.getValue().remove("Items");
-        compoundTag.getValue().remove("Lock");
+        if (compoundTag != null) {
+            compoundTag.getValue().remove("Items");
+            compoundTag.getValue().remove("Lock");
+        }
 
         return compoundTag;
     }

anvil-loader/src/main/java/mc/world/anvil/AnvilChunk.java

@@ -127,7 +127,7 @@ public class AnvilChunk implements Chunk {
 
     @Override
     public Biome getBiome(int x, int z) {
-        return Biome.getById( biomes.get( z << 4 | x) & 255 );
+        return Biome.getById(biomes.get((z >> 4) << 4 | (x >> 4)) & 255);
     }
 
     @Override

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java

@@ -169,8 +169,8 @@ public class ChunkDataPacket implements SCPacket {
 
                         if (biomeWrite) {
                             biomes.writeByte(chunk.getBiome(
-                                    chunk.getX() << 4 + x,
-                                    chunk.getZ() << 4 + z
+                                    (chunk.getX() << 4) + x,
+                                    (chunk.getZ() << 4) + z
                             ).getId());
                             if (x == 15 && z == 15) {
                                 biomeWrite = false;