If you make a cage for monsters out of glass or fences and trap monsters in the cage, when you quit to the title and go back in the map, some or all of the monsters have "teleported" out of the cage. This is very frustrating when trying to capture zombies and keep them because this bug causes them to teleport out of their cage and burn and die. Please fix.

To Reproduce:
1. Make a cage out of fences or glass (the dimensions don't matter)
2. Trap monsters in it and make sure they can't get out
3. Quit to the title
4. Go back in the same world and some of the monsters have left their cages (doesn't always happen so you might want to try it a few times)!

Please fix!