Same here .. and the battery starts to learn the patterns again.
I wipe the cache partition, repair Apps and and ensure all the store apps are up to date after every update. Whilst I tend to do a hard reset after major updates I do not perform this task immediately,evaluate how the device is running/battery life at the first stage.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .