It seems to happen to me on any template if I backspace the article title name while it is actively saving

It seems to happen for me every time I create an article. I don't have to backspace in the title, just type a title and wait. It will save two new articles, one of which is the generic template.

This started happening to me today, as well.

It doesn't happen all the time, looks like you need to press a key in specific moment (around autosave time).

I've had something similar happen a few times when autosave hits (i assume) while i'm mid-way through writing the title of a new article, and then the next autosave will save a new article with the full title. its not a massive issue as I can just delete the temp save one... but has been a bit annoying.

I'm seeing similar. Every time I create a character article, I'll find I have a second character article that is empty and untitled. It seems to happen when I name the article during the initial editor pop-up; if I close the popup without interacting with it and then open it again in the normal (modern) editor, there is no extra article and no new one is created by titling and modifying the original.

This is happening on Firefox on Mac.

I see this when I open a new article prompt that is blank into the old editor. When working from new modern editor this doesn't duplicate the prompt. I ran a test myself as I was sick of the duplicates showing up.

By old editor do you mean the popup window ?