http://musicbrainz.org/edit/18229245 left a bunch of orphaned recordings, at least the 16 in http://musicbrainz.org/edit/12694935 but presumably also the ones from disc 1 which I cannot find.
When a release is removed, any recordings that appear only on that release should also be removed.
Related to MBS-2529?
Empty release recording (not Standalone) not purged due to "Edit Recording"
Add Medium/Add Release do not show up in recording edit histories
Add Medium edits don't always link recordings, even those that exist
Orphaned recordings do not get removed (regression)