Family Sharing- some items hidden

I've set up family sharing with my family years ago, but it's hardly used. I just bought the Kpop Demon Hunters soundtrack, and my wife wants it too. So on her phone we pull up the music store-> purchases-> me and there is the whole list of all the music I've purchased. Organization is horrible.

But, we can only find three of the songs from the whole album. I've tried about 6 artists from the soundtrack (that I can see), but only those three songs are showing up. Is it possible that some items are not shareable? I've read that some subscriptions are not shareable, or in-app purchases. But from everything I've read there should be no problems with music purchases.