Raise to wake is really buggy on this version. Minimal movements triggers raise to wake and if you have face unlock enabled, it will instantly unlock if phone is anywhere near your face.
I've disabled raise to wake for the meantime until it gets fixed.
I was going mad due to this and tried checking with fellow testers on beta test forums but nobody confirmed.
For me the problem is more acute.
If the phone is in vertical position and I switch off the screen using power button, it automatically wakes the screen and face unlock unlocks it.
Few quirks in this , happens only when phone is in vertical position, happens only if I switch off screen when phone is unlocked.
If I switch off screen when the phone is on lockscreen (locked state) the screen does not automatically wake up.
I am also on 8.9.20 beta via incremental update by ota.
---------- Post added at 07:30 PM ---------- Previous post was at 07:29 PM ----------
Probably !! I'm not a beta tester & didn't get 8.9.18... I'm upgrading from 8.9.13
Maybe that is the case. Strange u r getting ota without being a tester.