Currently I have 2 corpses at my base that have not spawned bones on last butchering "tick" and just lying there and not decaying. You can pick them up, move them. They block passage when you bump into them, just like normal corpses would, but you cannot do anything else with them. Right click gives nothing.
My guess is that it happens when there is a trouble to "spawn bones" when you butcher. First corpse happened when I was butchering boar on very steep cliff (max possible angle while terraforming), second - I was butchering sheep while all other animals were all around me.
I guess its fine that we have those, but this might be annoying if they will keep stockpiling on us
