For some reason the dialog that loads upon clicking on images in cover art edits is not activated in editing histories but instead loads the image standalone in the current tab, e.g. :
https://musicbrainz.org/release/012b679a-a4a5-450a-a454-6045293636f5/edits

On the edit page itself however it works:
https://musicbrainz.org/edit/67041101