Post edit error: "More than one character required

It looks like this happens right when the edit window is timing out. 🤔
I was right in the middle of editing my post, made my changes, clicked save, and—boom—suddenly I’m stuck in a quote block with some error message telling me I need to enter at least one character. This has happened to me at least three times over the last few months, and honestly, it's getting pretty aggravating.