Album "Has No Songs" yet as member of a Playlist has four songs

This is weird. I'm listening right now to a performance of Beethoven's Piano Sonata No. 13 -- Opus 27 No. 1 played by Jeno Jando. I'm playing it on my MacBook Air. I managed that by going to a playlist that's viewed by Album on the computer, but I'm using the Remote app on my iPhone, so I see all the tracks of all 32 of the sonatas, including the four tracks of #13.

But, if I use Album view and make my way to the album. It says it has four tracks, until I open the album when it gives me the No Songs message.

I guess it doesn't matter that much given that I've found a way of actually playing the album, but what is going on?

BTW: what's with the topic "iTunes for Mac"? I'm using the latest released version of the Music App on Catalina.

And here's why this issue is more than it appears -- the work has now finished. Had I been able to play the album, I be hearing nothing right now. Instead, the playlist has moved on and is not playing the next sonata to me.