Example is this question - I answered it, hit submit, then I've seen a glimpse of standard "an edit has been made". Now I don't see any edit history, but there is last line in a question I'm sure wasn't there at the beginning. Is it supposed to work that way? If so, when? Or am I going crazy?
No you're not going crazy, there's a 5 minute grace period on editing:
In order to prevent a series of tiny edits from showing up in the revision history, a single user who edits a post is given a 5-minute grace period. During this period, any additional edits they make are collapsed into the same edit in the revision history, displaying only the final outcome of all their edits within that 5 minute period. The grace period ends after exactly 5 minutes, but also ends if another user edits the post, at which time their grace period begins.
Source: How does editing work? on Meta.SO