Tags added do not appear in Apple Music

[ohrenkino]

See e.g. here:

Apple Music app and mp3tag Data out of Sync

mp3tag version: 1.8.23 (107) Apple Music version 1.4.6.32 macOS version: 14.6.1 (23G93) Apple Music library on external SSD connected over USB-C. This behavior has been seen (thus far) for ALBUM ART, COMMENT, DISCNUMBER. At times, mp3tag displays outdated content for above tags after updating the tag's values in Apple Music app. Only work around, has been to purge tag content from within mp3tag (which will purge from view in Apple Music app), and then re-enter updated tag content using Appl…