Versions

Betweenlands version:

MC1.12.2, Betweenlands 3.4.1

Forge version:

14.23.5.2796

Singleplayer or Multiplayer:

Happens in both

Installed mods:

Screenshot below

Description of the problem

Harlequin Toads spawning in the over world
Issue only happens in certain biomes, screenshot shows roofed forest
Only seen toads so far, unsure if it happens with other mobs yet
I'm sure its some other mod causing the issue but no clue which, possibly issue with biome bundle/OTG id suspect. Couldn't find any known issues like this

Pictures:

https://imgur.com/2bJTy25 - modlist
https://imgur.com/Ce2iQ5Z - toads spawning

Yes, this is caused by another mod. None of our entities normally spawn in the overworld except for Dark Druids. You can most likely change this in biome bundle's configs.
I'm assuming the modpack's author intentionally made them spawn there (unless you made the pack yourself of course).