When I join the world mobs instantly stop moving I get teleported around and everything is glitched, and eventually, it will crash saying timed out or server closed. My friends joining cant move at all and also crash.

What I expected to happen was...:
I could play in my realms server

What actually happened was...:
I crashed and others did too whenever they joined making it completely unusable after we put a lot of effort into that world.

Steps to Reproduce:
1. I don't know what initially triggered the bug but one day I logged into start playing and couldn't because the server kept crashing.