If you try to add/update any of the relationships or external links for an entity that has a "lot" (undetermined threshold) of them from the edit page for that entity, you'll get "The data you have submitted does not make any changes to the data already present."

This is related to the number of relationships the entity has, because the underlying issue is that we're attempting to save all of them to sessionStorage, which triggers a "quota exceeded" error.

Originally reported at https://community.metabrainz.org/t/bug-adding-editing-relationships-for-specific-artist/667073