Cover art woes in music files

[He-who-is-tired]

Maybe a thing you could check would be to find one of the problematic songs, in an album list, click the 3 vertical dots on the right hand side, and select 'edit images'. It seems to bring up a dialog that shows the item's resolution, so you might be able to figure out which copy of an image file is being used. It might allow you to choose between the embedded image and the one being used for the album.