Camera green indicator active even when not using camera on iPhone

Sometimes, I notice the green camera light at the top of my screen turning on automatically, indicating that the front camera is active, even when all apps are closed and the screen is locked.

I understand that this means an app is using the camera in the background. However, when I swipe down, it shows that the Camera app is the one accessing the camera, even though I haven opened it and have closed all background apps.

Does this indicate that my phone has been hacked, or is this normal ?

And how can I fix this issue?

[Re-Titled By Moderator]