When backing out of the submit page you get this question where you have to guess which button does what.
I think it’s different if you back out of a post with no text in it… Since your example has text in the box still, it offers to save it.
If there’s no text, I don’t get a prompt at all
Ah, I figured it out. It’s specifically the title field for some reason. Weird that there are different dialogs for the same action.