Focus Bug or Blip

I have been using “My Album” on my iPad and when I went to Focus it displayed the “spinner” but appeared to get nowhere. I went back, tried again and then got a display which left many focus fields unpopulated (see screenshots), the iPhone worked perfectly. Lot’s of closing apps, shutting down the core & rebooting made no difference.
I tried going to “Artist/Focus” and it worked? Went back to “Albums/Focus” and then all fields were populated and now all seems fine. I’m not sure is this is a “one-off” but thought it’s worth recording.