example:

https://beta.musicbrainz.org/artist/ee5a3ca1-79c6-4433-93d3-574adb53f0ad/relationships

 

I had added Anwyn to the band Around the Hearth, saved the edit, then after finding what role she played in the group, I added them with the relationship editor.

On the editor page it added each "role" (i.e. instrument/vocal position) as a seperate line, upon saving, it merged all of the roles together but then create a seperate entry for the group membership (as it currently stands)

The same happened with https://beta.musicbrainz.org/artist/5388c453-6ad6-47e9-9d47-c341edce4a4e