I found a bug with Lycanite's Mobs, Mo' Creatures Extended, and Animus for 1.12.2. Essentially Mo' Creatures Extended's fishy mob can spawn in lakes of Lycanite's ooze where it kills the fish. If Animus is installed this will result in Minecraft freezing and crashing due to a ticking entity bug. I've only tried this with spawning the fishy mob into ooze so I cannot say for certain if this is every creature in Mo' Creatures Extended and every type of harmful fluid in Lycanite's Mobs works or not.
crash-2024-03-24_09.42.55-server.txt
The mod list is just:
DrZharks-MoCreatures-Extended-12.4.1.jar by ACGaming
lycanitesmobs-1.12.2-2.0.8.9.jar by Lycanite
BloodMagic-1.12.2-2.4.3-105.jar by WayOfTime
Animus-1.12-2.1.8.jar
Guide-API-1.12-2.1.8-63.jar by TehNut