World Breaks When I Die In Overworld

Put the summary of the bug you're having here

What I expected to happen was...:
When I die I respawn and the world continues as normal

What actually happened was...:
When I die (in overworld) the game freezes shortly and then continues working, but after a few seconds the world stops updating, all mobs stop moving, etc. When I reload the world my game crashes.

Steps to Reproduce:
1. Create a world
2. Do /kill or die from any other means
3. Wait for game to unfreeze
4. Go punch a few mobs and see if everything stops in place after about 30 seconds or less. One things stop updating, placing blocks makes no sound, water doesn't flow, mobs stay invulnerable forever after you punch them, and they freeze in place.