2 PMs with link sent.
The first one (Jack Johnson) - MB used the POPULARIMETER tag but currently doesn't show rating in the app.
The second one (Linkin Park) - MB used the RATING tag. I can't figure out why the switch. It's rating does show up in MB.
Here's the pattern I've noticed (all ratings managed soley by MB) -
FLAC files with the POPULARIMETER tag, their ratings aren't shown. Recently MB started tagging FLAC with the RATING tag instead, these continue to be shown in the app. (Recently tagged, as in the past 1-2 weeks?) Although the problem of some ratings not showing only presented in the last 24 hours.
MP3 files with the equivalent POPM tag don't appear to be affected. They still show their ratings in MB. If I tag an MP3 right now, MB still uses the POPM for it. As of right now, MB continues to tag FLAC with RATING tag.
Edit 2: I suppose a short term solution, if this is now the new default behaviour for MB, is to convert all FLAC files with the old POPULARIMETER tag to RATING in mp3tag.
(While we are talking about tags, I also noticed that deleting the 'ENCODER' tag (ex 'reference libFLAC 1.3.3 20190804') with MB inspector doesn't seem to have expected results. After deleting/saving, inspector shows it upon checking again.)