After an accidental emergency call, discovered the cause of this was the "tap to turn on screen" feature -- and my leg was tapping it through my pocket. (On my phone, there was no way to remove the emergency call button on the lock screen.)
Thank you! That explains the strange wakeups I get on the phone when I put it my pocket. Every time I think I am crazy “I remember turning the screen off” but then I get it out later and it is on and has the camera app active.
