You Can't Spawn Hostile Mobs in Creative.

Put the summary of the bug you're having here
I couldn't spawn ANY hostile mobs in creative. For some reason I could only spawn passive mobs.
What I expected to happen was...:
Describe what you thought should happen here
I thought the zombies would spawn.
What actually happened was...:
Describe what happened here
I started a new world on flat and spawned near a village. Since I was in creative I tried to spawn zombies and they disappeared as soon as I right-clicked. I tried all the hostile mobs and again they turned invisible.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Start a flat world in creative and get near a village.
3. ... Try to spawn hostile mobs.