Remove references to the now-broken BlockEntity#save(CompoundTag) method (#8235)

src/main/java/net/minecraftforge/common/extensions/IForgeBlockEntity.java

@@ -54,9 +54,7 @@ public interface IForgeBlockEntity extends ICapabilitySerializable<CompoundTag>
     @Override
     default CompoundTag serializeNBT()
     {
-        CompoundTag ret = new CompoundTag();
-        self().save(ret);
-        return ret;
+        return self().saveWithFullMetadata();
     }
 
     /**

src/main/java/net/minecraftforge/common/util/BlockSnapshot.java

@@ -84,7 +84,7 @@ public class BlockSnapshot
     @Nullable
     private static CompoundTag getBlockEntityTag(@Nullable BlockEntity te)
     {
-        return te == null ? null : te.save(new CompoundTag());
+        return te == null ? null : te.saveWithFullMetadata();
     }
 
     public BlockState getCurrentBlock()

src/main/java/net/minecraftforge/fluids/capability/TileFluidHandler.java

@@ -52,11 +52,10 @@ public class TileFluidHandler extends BlockEntity
     }
 
     @Override
-    public CompoundTag save(CompoundTag tag)
+    protected void saveAdditional(CompoundTag tag)
     {
-        super.save(tag);
+        super.saveAdditional(tag);
         tank.writeToNBT(tag);
-        return tag;
     }
 
     @Override