https://musicbrainz.org/report/SuperfluousDataTracks says "A data track should be deleted if it is the last track of the CD and there is no disc ID", but that's not always true - often, it should just be marked as a data track. More problematically, the report as it is now actually does return also releases where the data tracks are already marked as such, such as https://musicbrainz.org/release/d82990d7-8531-4ddd-bba4-cd2123e4c1ef