I had the situation however that the cover art that was fetched / embedded by beets is not identical to the one that MB Picard embeds. And at least in that case the MB Picard cover art was the correct one (for that release in MB).
So the fetchart plugin using coverart source doesn’t produce the desired results, which is fetching the cover art associated with the musicbrainz release in musicbrainz.
Or does it take more than a day for the cover art to be synced from musicbrainz to the coverartarchive?
Am I missing something here?