Given for example the following release on 45cat.com
When trying to add that one on the corresponding Musicbrainz release https://musicbrainz.org/release/e4663bbf-0ef9-4c0b-a147-a337f1c41552 it gives me the following error:
On the Muscibrainz release group Release group “Sandy (4th July, Asbury Park)” by Bruce Springsteen - MusicBrainz it actually works which looks plain wrong to me