Totally bad the android 11 there no was problem after upgrading and yesterday updating still the same. Worst signal a lot of bug .I had signal from my operator in my work but after this android upgrade I no have signal. Totally ***** with 5G my phone working with n9w only on 4G. Why I paid a lot of money for the 5G phone?
Android 12 isn't all that much different or better, a security update for 11 would be good though. Nokia did the same with my phone though (Nov 21 update) and then it jumped to Android 12 Dec 2021 build with January 2022 Security patch for Google Play this week. So maybe the same will happen for your Samsung Note? Apparently what holds the releases up is certification by UK authorities and the phone networks even when the phones are unlocked retail models.