Potential screenshot of FaceTime call?

I’ve seen this question before, and I wonder if there is any answer/resolution to the question of whether there are unauthorized screen shots being taken during FaceTime calls. I have been using FaceTime quite a bit during the pandemic, and increasingly I have the suspicion that a 3rd party is taking photos while I am on a call. It happens regardless of whether I call or answer a call. The person I talk to can also see a flash or “blink” of a black screen as if one of us took a screenshot, but we haven’t. It might happen once or several times during a call. I generally feel secure with Apple products and apps, but this is making me feel very uneasy.