I've gotten into the habit of always restarting after an update (iOS, iPadOS, watchOS, macOS)... preventive maintenance. You'll notice small ‘uncertainties’ being resolved. Running Onyx every now and then also helps (followed by a second manual restart).Now it looks like this problem tries to resurface from time to time. One other remediation seems to be force-quitting System Settings.
If this blessed final 26.3 comes out, I'll test the forced exit method from system settings.