Invisible mini zombies attack

Put the summary of the bug you're having here
Being attacked by invisible mini zombie at spawn.

What I expected to happen was...:
No mini zombies that are invisible.

What actually happened was...:
Damn invisible mini zombie attacks me. I know because I can hear it, and I am taking damage. This is not a joke.

Steps to Reproduce:
1. create world with -840222844129379185 seed
2. delete world -840222844129379185
3. create -840222844129379185 world again
4. observe that invisible mini zombie is attacking me and I can't hit back