Hi Chris,
It should not be a widespread issue since other users experiencing problems with sync have reported it fixed after we hotfixed the crashing issues. Sync should, in fact, work better than before we targeted Android 12. Just to be sure, can you please let me know your device model so I can try to find/test using it? As usual, you should also whitelist the app from optimizations/allow the new "alarms & reminders" special permission (it is ON by default, only do this if you turned it off specifically first)/check that your notification settings are correct/etc.
Martin