Spamming console with warnings near custom mobs:

Ignoring unknown attribute 'forge:entity_gravity'
Ignoring unknown attribute 'forge:swim_speed'

I second this.

This seems to be an old bug from back in 2021 (found reference to it on the curseforge issues page).

I'm also getting this bug, and it's causing chunks to not load and the server to crash. Which seems to have been happening for people for a few years now.

Had to remove the mod for now as it's just breaking things.