https://musicbrainz.org/report/ReleasesToConvert returns https://musicbrainz.org/release/f831597f-1512-3dbb-aaa3-e961ed63afa6 - which has a hyphen only on all tracks on medium 2 (all one of them). The report though claims it is 'looking for releases where every track contains "/" or "-" '.

I'm not sure whether the per-medium check is desired. If it is, then the docs should change - if it's not, the report should