• Craft to Exile Version 2.15.3
• World Type singleplayer
• RAM Allocation 8GB

ground mobs from better animal plus do not spawn

Mobs from better animal plus are not found on the plains and in the forests.

Additional Information
When I played before (a year ago) these mobs spawned, in the new worlds they didn't. Underwater mobs will spawn.
UPD: If you spawn a mob and move away from it so that it is not in your field of vision, then it disappears.

hm, are you sure you're in the correct biomes? seems fine for me

Well, I think yes: vanilla forest, plains, taiga, etc.

Or do they spawn in non-vanilla biomes?

I created a new profile, but the problem persists(