You have to manually delete the conf-backup folder from your site’s zip file, even if you literally just exported it minutes ago.
How this stupid and incredibly annoying bug can still be in Local, I have no idea. It was discussed here quite a few times and quite a few versions ago.
So far I’ve not been able to find a way to exclude this directory from site exports, and since I’m migrating to a new MacBook, I’ll be deleting this from zip files for hours.