When mobs want to cross lily pads they start walking in circles instead of walking in strait lines.
Steps to reproduce:
1- Find a lake or ocean
2- Places a 3 wide line of lily pads
3-Spawn a villager at one end and a zombie at the other
4- The zombie will walk in circle while trying to reach the villager
Was tested with creeper, zombie, villager, pig and sheep.
Confirmed