What happened?

In custom biomes from "Biomes O’ Plenty" or "Oh, The Biomes We’ve Gone," no mobs appear. Mobs only spawn in vanilla biomes.

Minecraft Version

1.21.1

Modversion

2.2.0

Modloader

NeoForge

Additional context

No response

Before submitting

• I tested that the problem is caused by this mod (the bug does not happen when removing this mod)
• I checked that there are no similar posts (open or closed) related to the this problem

That's the default behavior, if you want them to spawn in other/modded biomes you need to adjust the configs.