This seems like something I could probably fix with a few edits. But I don't really know how. Should I be looking at undead traits, skeletons, or the entangle spell? What should I be looking for?
Skeletons have both the undead and plant traits listed in thier protos.tab entries, the exact details of who made those changes or why are unknown to me, but I do recall that someone who tested skeletons that had the plant traits removed, reported that they were then able to become entangled and still behaved how they should in other respects (not affected by mind controlling magic for example). Unfortunately I've not managed to locate this other thread to link the findings here yet.