Endermites don't spawn when endermen teleport and they don't attract endermen

Put the summary of the bug you're having here

What I expected to happen was...:
Causing endermen to teleport would spawn endermite

What actually happened was...:
Nothing spawned after many tests

Steps to Reproduce:
1. Cause endermen to teleport
2. Nothing will spawn
3. View the spawn chances in the code?