Affects Version/s: Minecraft 1.8.8, Minecraft 1.10.2, Minecraft 16w32b
Fix Version/s: None
Environment:Windows 7 Home Premium 64 Bit, 3 GB RAM (2.87 GB usable)
Java version 8 update 5, build 1.8.0_25-b18
Rabbits (and presumably other entities, but most likely rabbits because they are very small) get pushed into walls and through doors when you exit and re-enter a world.
Steps to Reproduce
1. Make or go inside a house with a door.
2. Fill the house with rabbits until you can't (or barely can) see the floor.
3. Exit and re-enter your world. A handful of rabbits should have escaped out the door, and some may have gotten pushed into the walls and died.