Hi @tinglish yes December security patch should come in due course. My device seems to be working well, it was mentioned there was a problem with uploading images here via Samsung Members, however seemed ok for me after wiping cache partition.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB One Ui 4.0,Android 12 Official Version.
I get that alot of people have had issues which is a shame,but also alot including myself have had no real issues. Sorry to hear you are having problems but the question was about December patch more so than anything else. Hope this update has solved any problems you may of had 👍