for some reason when mobs are in water blocks with oceanic plants and corrals (kelp, seagrass, coral fans and corals) they will spin around without hope of escaping. its almost like they are trying to walk on the surface as if it was a solid block

the video attachment just shows the reaction of 3 different mobs, please beware that most if not all of the mobs are affected by this, and that seagrass and the two non-solid corals work just as fine as kelp