I killed a few zombies which piled up 3 of them onto the same tile. Once it was clear i pressed B then selected the corpse to butcher. It advanced time but instead of butchering it said ‘There are no corpses to butcher here’ or something like that.
Known, caching issue. Current workaround is to either butcher the clothes if that’s useful for you, or to move off and back onto the pile.