What I expected to happen was:
When I left clicked on a creeper, enderman or spider in spectator mode and entered them they would have a "shader" (eg Creepers vision was green and spider has eight eyes)

What actually happened was:
When I left clicked on a creeper, enderman or spider in spectator mode and entered them the screen was black

Steps to Reproduce:
1. Find an enderman, creeper or spider (etc)
2. Enter spectator mode
3. Left click on the mob, notice how the screen is black when it didn't used to?