Iphone XR green dot on even while locked

The green dot (A.K.A the indicator that shows if the camera is being used), turns ON when the phone is locked. And when I unlock it or pick it up, it goes off. The recently used app it is showing is camera app. I did not accidentally turn it on. And today too, when it was locked, the green was showing, all the while I was unlocking the phone. I reset my phone twice now. Its scary.