1st bug is that when someone else breaks block in multiplayer you dont see this arm swing. looks instead like block breaks itself only. arm doesnt move.
2nd one is new in this snapshot only. when you not moving underwater you lose bobbles and die of lack of air but if you mowing underwater air bar just flashes beatween full and empty and dont kill you never mind how long you are underwater (infinity air).
3rd one is that sometimes when you with other person place block in exact same place at prety much same time, persons who place it first block gets replace with other one however he dont get block to inventory or it doesnt fall on ground it just disappear.
We showed all three bugs in one video:
http://www.youtube.com/watch?v=I67QT2Zx8nU&feature=youtu.be