Entities (skeletons, chickens etc) fall thru the block they are walking to after walking off blocks less then 1/2 in height but greater then 1/8th thick snow block. Could not check anything between the size of 1 layer of snow to half half a block did not feel like server hacking the thickness.

[Repo]

• Fence in an non snowy area.
  • Place a repeater or sink a fence post in the ground.
  • Spawn some entities.
  • E's should fall after walking over the repeater or a sunken fencepost.

E's should not be falling thru the blocks in this case. Further testing would be placing a double layer of snow and a triple layer of snow testing out the heights between 1/8 and 1/2 of a block in height.

Further testing showed sticking a fence in the ground and walking over it does cause this also. Having just a single layer of snow next to the fence or repeater also stops this effectively.