They wouldn’t day because everything would be open so there’d be no pressure to shoot a fart out of. Why gasses would be slowly released as death relieves pressure on the sphincters and let’s go. I imagine because of gravity and not being alive too keep muscles and whatnot on the correct places for normal function will just let all of your shit out too. It’s not that we need pressure to let shit out, but we use pressure to get it out in one go and we do so with many “airlocks” so we only lose what we need at that time.

This is mostly me talking out of my arse but it sounds right to me as i type it. I imagine i don’t have the specifics down but maybe the general gist?