One more thing I want to mention that I just discovered this morning.
After updating from Big Sur 11.2.2 to 11.2.3, I rebooted and went immediately to check my Printers in Sys Prefs, and found the whole print system had been wiped. I was curious about this because after updating from 11.2.1 to 11.2.2, and then not printing for a couple weeks, I found the same situation but wasn’t sure exactly when it happened. Reinstalling 4 printers – the OEM drivers plus QTR for 3 of them and the Piezography “Beta” Driver for 1 – took maybe an hour at most, but all my lost presets, custom paper sizes, etc, will have to be recreated as I need/use them.
On the positive side, the Gutenprint based Piezography beta driver had not been working previously, but is after this reinstall. Previous manual delete/reinstalls had not helped.
I’m searching for info about this problem now and will call AppleCare if necessary. I’ll report back if I find anything.