Mushroom Biomes only spawning Earth mobs

[ItsSoapBoat]

🐛 Bug Report
📝 Description
In mushroom biomes, only the earth mobs spawn (the chickens, cows, pigs, etc.) instead of mooshrooms or other mushroom mobs from other mods.

⭐ Describe the solution you'd like
For regular animals to not spawn in the mushroom biome.

🥟 How to reproduce?
Go to the mushroom biome

🔢 Which version of the mod are you using?
5.2.3.0

❓ Anything else you would like to add? Comments? Info?
You're pretty neato :D