It just so happens that there are still releases with disc IDs attached to mediums that technically can't have any. To more easily detect this and make it easier to remove them if necessary the disc IDs tab should be enabled in those cases.

e.g. https://musicbrainz.org/release/9162c1d5-9a59-3d35-821e-72141135ecdd/discids

• https://musicbrainz.org/edit/79737758
• https://musicbrainz.org/edit/79737757
• https://musicbrainz.org/edit/79737756

See also:

• [MBS-8456] It's possible to merge a CD with a Disc ID into a non-CD-format release
• [MBS-5340] It's possible to add a discid to a DVD-Video, and then it's impossible to edit the release
• [MBS-2519] Find a way to allow users to edit the Medium on pre-1982 (or undated) releases that have DiscIDs attached (as long as the DiscIDs aren't orphaned)