I'm having the same issue

. Gonna look for some magisk module
The irony... I was typing a reply to you to say the last update, 582, fixed a lot of things including that. All of sudden the phone completely freezed. The power button didn't work. After a while it rebooted by itself. After boot, after a minute or so, it freezed again. Auto rebooted. It went on that loop for like 5 or 6 times. Then i disabled wifi and mobile data on safe mode. Booted again and didn't freeze. Fortunately it's working fine now. Already backed up everything with migrate just in case.
I wonder if oneplus actually test the updates. Nevertheless, i got fed up by the last batch of bad updates i asked for a refund on amazon. Arguing the phone was behaving in an erratic way. They accepted my request.
I wanted to get out of this oneplus addiction, but the price for a 11 on amazon's second hand market was good. Plus a gift card discount. Plus the fact the Nothing phone 2 does not have an alert slider. So here i go again. F*ck...