Grouping Issue on Mac Controller

I have found what I believe is a bug in the Sonos controller, at least for macOS. I have notified Sonos, and they've asked me to call which I will try to do on Mon/Tue. But I suspect that others will see this with the Mac controller as I've noticed this on 2 different Macs on the same Sonos system. Further, I have tested this on a Win 10 PC and the same Sonos system, and the Win PC displays properly. I am interested to know if others see this...

I have a number of artists with many albums. I noticed that for artists with enough albums to force the Sonos app to group by letter, that if there is an album with a numeric title, it throws off the grouping. I have 2 screenshots attached:

Rolling Stones (49 albums) - The album 12 x 5 appears 1st in the list. Then, A Bigger Bang is still in the A section, but Aftermath falls down to the B section. This continues for other letters. All the way to the end of my Rolling Stones collection, Undercover falls to V. And the final album, Voodoo Lounge, does not appear on the list at all and I only see 48 of the 29 albums. However, if I go into the All view, I do see the Voodoo Lounge songs.

Rush (19 albums) - Similar to the Rolling Stones, my 1st Rush album has a numeric title, 2112. A Farewell to Kings falls to the next grouping, which in this case is C. You can see the pattern continue with Counterpoints falling to F and Fly by Night to G. All the way to the end of my Rush collection, Test for Echo falls to V. And the final album, Vapor Trails, does not appear on the list at all and I only see 18 of the 19 albums. However, if I go into the All view, I do see the Vapor Trails songs.

I have not included screenshots, but I have 2 other examples that display properly:

Billy Joel (17 albums) - My collection includes 2 numerically titled albums, and they appear 1st in the list. However, I have fewer total albums in this collection, and they do not group by letter. Unlike with Rolling Stones and Rush, all 17 albums do appear.

REO Speedwagon (26 albums) - This collection does not include any numerically titled albums, and all 26 appear properly grouped.

I am sure many of you have huge collections, so may notice the same problem.

Thank you, John