I'm also experiencing the same thing and it started happening on 10/29/2020. The message "A new iOS update is now available. Please update from the iOS 14 beta." appears every time I unlock my phone. When I go to Software Update it shows me that I am on 14.2 and that my "software is up to date".
I have tried adding the beta profile, rebooting, trying again. Removing the beta profile, rebooting, trying again. Same thing continues to happen.