AI mobs are broken

[Dopiotl]

Brief description of the issue

the AI of mice, spiders, mobs in general that all either move in a synchronous fashion like robots, in the same direction, at the same moment in some weird mice choregraphy in maint, or don't move at all
spiders will remain mooostly still and immobile for extended periods of time, staying silent, until they suddenly see you

What you expected to happen

for mobs to have a proper roaming AI like before

What actually happened

AI mobs are broken

Steps to reproduce

Play the game