I got this while pressing Ctrl-M (replaces ctrl-W in 5.97)
Maybe I also issue a bug reprt for Ctrl-M but I must first verify if this really inserts new code in my html, it should only export the WP theme… later, first this one:
each template part should be defined just once per theme with action Define template part. It can be included multiple times with the action include template part.
When I check for example archive.php I only find one template part, so I think it is a bug.