Find one bug in 1.12.2 Version mod:
as you know, the bag's fluid storagr capacity is 4 buckets each side.
here is the problem,lf one side full of water ,and l put 4 stack buckets in bucket slot try to take out it, all 4 buckets will vanish and water storage will empty,but only 1 water bucket on bucket output slot, this bug will cause player lose ertra 3 water and 3 bucket.