When copying information from an artist in Discogs, I cane across a Spotify link. I copied it into the MB artist, and it kicked it out, saying that the link was incorrectly formatted.
For those who are click-averse, the Spotify link takes the familiar https://open.spotify.com/artist/[id] format and changes it to https://artists.spotify.com/songwriter/[id] instead, and shows all the tracks that the artist was credited as a songwriter on. I’m not well versed enough in Spotify linkage to know if this is an old change, or a sign of things to come, but I’ve never seen it before.