Forge Version
36.2.33

Mods invovled
Aquaculture-1.16.5-2.1.22
alexsmobs-1.12.1
environmental-1.16.5-1.1.1
fins-1.6.2.jar
productivebees-1.16.5-0.6.9.25.jar
mysticalworld-1.16.5-0.3.6.27
upgrade_aquatic-1.16.5-3.1.2

(xaeros is just so i dont have to play spot the mob)
Xaeros_Minimap_22.5.0_Forge_1.16.5
XaerosWorldMap_1.20.6_Forge_1.16.5

Passive mob spawning breaks in both normal and peaceful difficulty causing mobs to not respawn
JDKDigital/productive-bees#258

This issue was originally found in a larger pack narrowed down to 7 mods being the possible culprit but finally being confirmed to be Alex's mobs after testing with it disblaed only mobs are spawning fine
https://youtu.be/c57EeUgVm2M

With alex's mobs enabled
https://youtu.be/6c0GVjC8Gcc

debug.log
latest.log

1.16.5 is no longer supported.