Hello,
There's a problem with the 4 new biomes.
I don't know if it's because they don't have registered biome types/categories, but mobs won't spawn in them.
Especially noticeable when other hot/warm biomes of the same type are full of modded mobs like gorillas and monkeys.

Anyways, love your mod, thanks for all your work, it's a pleasure to discover new features and to see the mod grow. Cya!