This conversation has been merged. Please reference the main conversation: Lightroom: Tone Curve Enabled not copied by Sync, Auto Sync, Presets, Snapshots
The Tone curve visibility problem continues to snapshots not saving correctly when the tone curve was in the "OFF" state, but I found a workaround for that and it wouldn't have helped me get out of this mess. (FYI, workaround is just updating the snapshot with the correct (off) settings again and the off state will stick).
If I hadn't spent so much time sorting through, rating, adjusting exposure, wb, and etc., I'd probably think it was faster just to delete them all and reimport them. All I can think of doing is to manually go through and switch the tone curve to "on" and then I'd be able to apply the necessary tone curve and be able to sync it again. But that's a pain and someone may have figured out a better way. If not, it definitely needs to be fixed, so if anything maybe this will enlighten someone who can fix it.