Global power management never worked right.Plot twist : it does not.
I do have to charge it twice a day. I never understood how do the users do to have 2 days of battery or 8h+ of SOT with actually using it with a few apps and just not leaving idling in an black screen with every sensors off and apps uninstalled.
Turn off all that junk, deal with battery hogs on a case by case basis. Individual app power management in settings does not invoke global power management.
-All- Samsung's need to be hand optimized for best battery life. On this device it seems to be critical. Use manual brightness control and avoid using is direct sunlight! Limits that to seconds not minutes. Temporarily disabling Google play Services will improve battery life; Gmail, Playstore, Google backup and Playstore are dependencies. All suck battery. No SD card slot makes you more depended on cloud, not good for battery life.
As for Android 12, avoid it... it's a mess.
In the last 2 years Samsung has been dropping the ball constantly... and continues to do so.
Last superb flagship release was the N10+ in my opinion and it still exceeds the newest releases in a number of mission critical ways including reliability, battery life, display color rendering index, form factor and expandable storage.
2 years, 3 generations and Samsung is still goofing up on its flagships... poor leadership.