During the use of two mods, mobs from zawa stop appearing
zawa-1.12.2-2.1.3
DrZharks-MoCreatures-Extended-12.3.1
UniversalTweaks-1.12.2-1.8.0

Spawn issues with third party mods are currently being investigated. You can read more about it in issue #78.

Closing this because it is already being tracked on the issue number mentioned above.