Refresh metadata in Music library does nothing

Please don’t fill in the album tag if the album is unknown.

  1. is this library actually using the “Plex Music” scanner and agent?
  2. If you go back to your 2nd screenshot above: the fact that the artist name appeared in the input field for the album title gives me the idea that something about your meta tags might be “special”. Is there a possibility that the file contains more than one type of meta tags? Or that one meta tag contains more than one value?

Either way. A future PMS version will bring some revamped scanner and agent code. It is worth revisiting this issue again after that.
If you have a spare machine or a VM, you could try this preview release (do not use it on your regular Plex server!) [Plex Media Server] Forum Preview for Music Metadata