Thank you for your feedback. You can withdraw from the Beta before attempting to unlock your phone. Please follow the steps below:
You can deregister from the beta program from Samsung member’s app -> settings -> one Ui Beta program status -> Withdraw. Once withdrawn you can download smart switch on the PC and restore to Android 12.
Please back up all data on your device before using smart switch to move back to Android 12 as this does reset the phone. if you do choose to move to Android 12 , we suggest you backup all your device data and master reset on Android 12 and try if for a few days. If issues are still not resolved, you always have the choice to withdraw and move back to Android 12.
One UI Beta Team.