It’s all fixed now, so no worries. It managed to get through to stable, though, and took a little while to get out so I’m assuming it wasn’t the regular tiny mistake somewhere.
https://forums.plex.tv/t/all-lyrics-have-disappeared/
If I’m getting them from CDs and old purchases from various stores, then surely they’re official releases though. Regardless, it’s less of the out of sync, more of the fact that some songs I have (that are relatively prevalent) flat out don’t have lyrics at all, in my experience.