Instagram green dot

When was scrolling my Instagram stories today I clicked on an advertisement and then played a YouTube video on it.

When I closed the video and went back to the advertisement I got a green dot in the right corner telling me that the camera was being used.

I checked my control center which told me that Instagram used my camera.

The weird thing is that I didn’t use it.

I can not find a way to activate my camera from a Instagram advertisement or story. I have not been able to reproduce the issue. Does anyone recognize the bug/problem or know a solution?