I was a previous user of the OnePlus Nord. And I was using the double tap to lock (which means screen off) and unlock feature in OOS. In OOS this feature saved My Phone’s power button. but it is missing in NOS. NOS has only the double tap to wake screen feature on the lock screen and double tap to lock on the home screen.
Nothing OS is missing double tap to lock (screen off) on the lock screen.
My muscle memory is irritating me because of that feature. Please add this in future updates.