We are aware of this issue and we have a ticket open with our team about this. This occurs when an artist exists in your library as a Composer but not as a Performer. In this case, access to the Performer page of the artist is not available. I’ll be sure to keep you updated when a change is made here, but we don’t have any timelines to provide at this time.
Once you add an album from this artist to your library you should see the Performer section become available.