In older versions of mixed in key exporting to a spreadsheet used to export every field, now it only exports collection name, track name, key, tempo and energy. Crucially, it does not export artist.
Since I have a lot of tunes that are track names like 'b2' I really need artist to be exported as well so I can discriminate between different tracks. It would be great if you could at least add artist to the export fields. Even better if you could choose what fields are exported when you export to a spreadsheet.