Medium format/release date clashes were supposed to only give a warning but not block editing if they already existed before the current release editor session (the message even says "This problem already existed before you opened the release editor, so you don't need to do anything about it."!) but it doesn't work - editing is still blocked. See https://test.musicbrainz.org/release/5c5c0b53-51ce-46e7-9ed4-fc98df8bd700