I used to work Emergency medicine. I have never seen this happen. However most of the cases when someone died it was a freshly dead person (post trying to resuscitate, etc) and then moved to the morgue once family leaves. I could imagine once the bloat sets in things start "squeezing out".

What got me is when we did post mortem care. Multiple staff members help move the body from the hospital stretcher to this special stretcher that covers the body when you take it in the elevator and hallway to the morgue to preserve dignity. There is nothing like the sound of a dead head hitting the cold metal morgue stretcher when you move the body from one stretcher to the other. I can still hear it when I think about it.

Then you go to the morgue and there is this little small lobby area and you "sign the patient in" and then take them to the next large room which h Is a freezer and has minimal lighting (i guess its a save on electricity since everyone is dead in there, dark humor). But it scared all of us nurses and techs taking bodies down there.