Problems with iPhone Music and backups
I have my 128 Gb iPhone 13 Mini (iOS 15.6) backing up and syncing to my 1 Tb M1 MBAir (OS 12.5). My MBA is my main machine, and has ~40 Gb of music on it, mostly ripped from CDs but about 10% purchased.
My iPhone, however, has ~80 Gb of music showing when I check my iPhone storage. This showed up recently when I started to get memory storage warnings that my 128 Gb was getting full. Except it shouldn't be full. It has twice the downloaded music it should have. It should have ~45 Gb free.
I tried to fix this by de-selecting Sync Music. That resulted in my iPhone having no identifiable downloaded music in the Music app. But when I checked the iPhone memory, it still said ~40 Gb was taken up with music (at least it was down from 80 Gb). I turned Sync Music back on, and an hour later, all the music was restored to the iPhone. But the playlists were not restored, AND the memory once again had 80 Gb of music.
How do I get rid of the 40 Gb or "phantom music" that is taking up my iPhone memory space? How do I get my playlists back onto my iPhone?
iPhone 13 mini, iOS 15