There’s a (visual) bug regarding the artist-artist relationship called “named after artist” (and possibly others but this is the one I found out…): it is missing its reverse link phrase “inspired the name of artist” when I am on the edit tab of the target artist.
For example from the main page Relationship type / Named after artist - MusicBrainz this relationship is visible in editor view both for source artists Kodály Quartet and Alban Berg Quartett but it’s *not for targets Zoltán Kodály and Alban Berg.
The bug appears to be just visual though as the relationship can be found anyway on all the artists relationships tab.