Thanks. What I meant was when I unlock my phone, there's a little "camera is being used" icon that pops up momentarily. After the unlock. I don't use face unlock. I thought it was an anti theft thing, but that's disabled too.
The little indicator stays for a while after activation to prevent apps from pinging the camera for a few milliseconds without a trace. It doesn't necessarily mean that the camera is still being used, though it could be if it stays around for longer than a second or so.