(Aside: MusicBrainz desperately needs some sort of rate limit for beginner editors. Enthusiastic new editors who haven’t read/internalized the style guidelines can create enormous volumes of work for other editors who care about correctness, and that’s not even counting the messes that never get noticed because they aren’t linked to artists with lots of subscribers.)
Ah, thanks for the link. I can understand the reason for this behavior for some relationship types, but it still feels confusing for a relationship to be listed on an entity’s relationships page but then disappear after clicking “edit”. Another edge case to file away, I guess…