Ah, the joys of synchronization.
I noticed earlier today that some of my Apple Music library changes weren’t showing on my Apple TV. After attempting to initiate a cloud sync, Apple Music told me there was an error and it didn’t recognize my library. What? So the fix allegedly is to turn sync off and back on. No big deal, only 42,927 items. I was going to continue the re-rip project but instead I’m waiting to see if the re-sync to the cloud actually works.