Camera in use but settings does not show what app

Many times I pick up my iPhone 11 and the green light is on indicating the camera is is use. I go to settings and it does not show what app was using it. I tried disabling all the apps that have ever used the camera and I still see the light on sometimes. What is happening and how can I find out what is using the camera. Please do not reply with the standard reply of look under settings->privacy->camera as everything there is disabled.