Describe the bug
Setting the gamerule doMobSpawning to false does not prevent any mobs from spawning.

To Reproduce
Steps to reproduce the behavior:

1. /gamerule doMobSpawning false
2. Mobs still spawn despite the gamerule being false
3. pain

Expected behavior
For mobs (both hostile and passive) to stop spawning

Info (please complete the following information):

• Modpack Versions: 2.77.5, 3.0 Beta 2
• Server or Singleplayer: Singleplayer & Server
• Versions the world were created on: 2.77.5, 3.0 Beta 2

Additional context
probably incontrol or smt being funky

Nothing we can do about this