I spotted this when looking at the Sort worksheet:
It looks like the comma in the Album Artists column has been mistaken for a delimiter and created a 2nd item. Is this a formatting error or would the fix have written to tags or a ; delimited tag to Album Artists (or whatever it maps to when written as a tag)?
I’m seeing exactly the same for all entries in the Album Artists column where the artist name has a comma e.g. Crosby, Stills & Nash


