I try to re-tag a file tagged previously as recording in the release.
The release has been deleted from MB since then, the recording still exists.
With Picard 2.3 I get the "could not load album $MBID" message with the "Unmatched files" subsection (where my file appears). I can drag my file to the left side, run the acoustID matching, and the MB recording appears as a "non-album track".
With Picard 2.4 / 2.4.2 I get the "could not load album $MBID" message but no "Unmatched files" subsection. So my file appears nowhere and I have no way to retag it.