Crashing Upon Contact

Put the summary of the bug you're having here

What I expected to happen was...:

The villager would fall through the pressure plate without the pressure plate creating copy's of itself

What actually happened was...:

The villager fell through the pressure plate and the pressure plate created many many copy's of itself, instantly crashing the game.

Steps to Reproduce:
1. Choose to generate a debug world in the options
2. Generate using this seed: -924004394427149979
3. Make an entity that triggers stone pressure plates (i used a villager) fall onto the stone pressure plate at 181 70 -475 .
4. You will see that the game crashes.