i also have an issue, everytime im using this mod to play as a lizard, (im trying with a white lizard, so maybe its just an issue with it) but everytime i kill something, the lizard wont drop the corpse, even when i disconnect, im also having the same issue as you, each time i try to pick it up, it acts like its not there, as though it was just part of the background and decoration that i cant grab. im gonna keep trying to find a way to fix the ungrabbable spear thingies glitch without getting the mod creator involved, but it may just be intentional