@H4RR1S I have only had minor issues with Beta and final version. However there are members like yourself with more pressing issues. You could clear the cache and Data of affected apps, though seems there are quite a lot. As mentioned good idea to clear the cache partition after an update by the following steps:
- Turn off the device.
- Connect To Computer or plug in USB-C Headphones , Press and hold the Volume Up key and then press and hold the Power key (plus Bixby Key if phone has one)
- When the Android logo displays, release all three keys.
- An 'Installing system update' message will show for 30 - 60 seconds before the Android system recovery menu options appear.
- Press the Volume down key several times to highlight wipe cache partition.
- Press Power key to select.
- Press the Volume down key to highlight yes, them and press the Power key to select.
- When the wipe cache partition is complete, Reboot system now is highlighted.
Press the Power key to restart the device.
Good practice to also use the Galaxy App Booster https://itnext.io/magic-trick-of-galaxy-app-booster-684e1984576e
If that does not help matters consider a factory reset (vital to back up Data beforehand though). However there should be a bug update for your device in due course. https://eu.community.samsung.com/t5/galaxy-s21-series/26-nov-21-bukg-latest-android-12-bugfix-update...
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
