This happened on my iPad mini 6, PadOS 17.3.1, portrait orientation. From the album wall, I long-pressed the top-right album to try out the album info feature. A window began to appear, then vanished. After that, Longplay was locked up, I couldn’t click anything, nothing was responsive. I killed the app and reopened it. Now I was able to get info on the album. About five minutes later, it happened again, same album, vanishing window, total lockup.

I did some experiments: To reproduce every time, go into settings gear, click Done, then try to do album info, and it locks up every time.