Yes you guys are right. It is a corpse which is "fake dead" in my case a random bystander near Thrumbo at the coast where the fishpeople attack. Problem is that this was 25h ago and the corpse despawned and left only a pouch. Picking up the pouch and putting it in the camp chest does not work. Loading the old save where the corpse is still there and putting it in the chest fixes the 33% crash.