Some album art not displaying in new Music App, Catalina MacOS

Hi. Since upgrading to Catalina MacOS I've noticed that not all my album art is displayed in the new Music App (all my album art in iTunes displayed with no issues). If I select an album which does not display album art (grey box/musical note), and play a song within that album, the larger image of the album displays as a grey box/musical note but at the top of the screen where the track time counts upwards it shows a very small image of the album art. So the album art is definitely there somewhere within the file but not displaying properly. Is this a bug in the new Catalina MacOS?