In 1.11 is was made so that creepers would be able to spawn in a 1.8 block tall area (under upper trap doors) this would normally allow for creeper only farms, a thing that bedrock desperately needs and has needed for years. Anyway, the issue is that everything spawns under trap doors now. Zombies, witches, skeletons etc.
Only creepers, spiders and i think baby slimes should be able to spawn in an area under trap doors.
How to reproduce.
1. create a flat world, keep it daytime.
2. make a 32x32 room of solid blocks, so that its completely dark inside. The room should be two blocks tall.
3. put any kind of upper trap door on the ceiling
-this should allow you to walk under it just fine
4. observer as creepers, spiders, and zombies all spawn under the roof and walk around freely.
Only the creepers/spiders should ever spawn
It has become pretty apparent that bedrock doesn't have proper hit boxes for most mobs, for instance you cannot prevent spider spawns as they spawn in a 1x1 area. When fixing this, it would be amazing if at least the hostile mobs in bedrock where given a proper hitbox, like those of java.
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Just tested this in the latest beta (1.13.0.6) and it's definitely still an issue although the 1.13.0 wiki article claims it should be fixed.
Tested the latest beta (1.13.0.9) and can confirm witch spawning in the same creeper farm has stopped. (awesome)
Spiders do still spawn. Hopefully that will be fixed, but if that is intentional then the wiki should likely be updated.
In my 1.12.1 survival world I have a dark room surface-only spawner with trapdoors. I get creepers, zombies and spiders, but no skeletons or witches. [Edit: I finally did get a witch. It took a long time.]
@unknown: Spiders spawning is working as intended. They only need a 1 block vertical space. They need a 3 x 3 space horizontally, so you can stop them by placing a block (e.g. a button) on every 3rd block in a grid pattern. Of course, that reduces your spawnable blocks by 1/9, so some people just let them spawn anyway. Edit: This doesn't work. I think it was supposed to be carpets, not buttons,.
I have tested this as well. As soon as they said creepers would spawn in 1.8 blocks. Same results, everything spawns, so still usless for creeper farm.