[MC-278374] Mobs won't spawn in superflat deep dark world when gamerule DoMobSpawning is set on true

Steps to reproduce:

1- Create a superflat world with the deep dark biome id on it.

2- Turn on the DoMobSpawning gamerule.

As you can see these mobs won't spawn in the superflat deep dark world.

Comments 3

The Deep Dark biome doesn’t spawn any mobs regardless of world type. Not a bug.

Furthermore, your game is modified. Only bug reports occurring in vanilla Minecraft are accepted on this bug tracker.

oh yep, you're right so that WAS not a bug. right?