When using a bucket on cauldron you don't get the water
Infinity bow doesn't work on tipped arrows (if this is intended it is an unfair change)
Mob spawner cages, the mobs are stationary instead of spinning (I think I prefer this as it is easier to identify the mob)
EDIT: More bugs:
When trying to punch items etc. the items take twice as long to mine in single player. The item disappears then instantly reappears where it was, then after some time it pops into my inventory. Definite bug please fix this is gamebreaking!