Fix silo NBT fixer being triggered on normal silos

Author: hlysine

src/main/java/com/hlysine/create_connected/mixin/itemsilo/ContraptionMixin.java

@@ -40,7 +40,9 @@ private void fixNBT(Level world, CompoundTag nbt, boolean spawnData, CallbackInf
             Map.Entry<BlockPos, StructureTemplate.StructureBlockInfo> entry = iterator.next();
             if (!(entry.getValue().state().getBlock() instanceof ItemSiloBlock))
                 continue;
-            if (!entry.getValue().nbt().contains("Length") && !NbtUtils.readBlockPos(entry.getValue().nbt().getCompound("Controller")).equals(entry.getKey())) {
+            if (!entry.getValue().nbt().contains("Length") && (
+                    blocks.get(NbtUtils.readBlockPos(entry.getValue().nbt().getCompound("Controller"))) == null ||
+                            !(blocks.get(NbtUtils.readBlockPos(entry.getValue().nbt().getCompound("Controller"))).state().getBlock() instanceof ItemSiloBlock))) {
                 entry.getValue().nbt().put("Controller", NbtUtils.writeBlockPos(entry.getKey()));
                 entry.getValue().nbt().putInt("Length", 1);
                 entry.getValue().nbt().putInt("Size", 1);