Apparently, this is ongoing since at least 2021. I killed all enemies on screen, corpses despawned, and the pic is what I see.
The difference I see from that post is the health bar remains showing the last health snapshot before the killing blow. This isn’t consistent, but I haven’t found if anything consistently removes it. This is on a brand new character made a few minutes ago.
Side note: could we get a “known bugs” thread? I would assume this is known and low priority, but search brought up nothing newer than the linked one.