+1, it existed on my s21 base exynos as well. It's something to do with the Samsung camera app. This shouldn't be happening on their top flagship phone lol.
Note that this only happens right after opening the camera from a cold start. If you try to play around with the camera and then reproduce it you might not be able to.
The April update is supposed to have fixes for this. I haven't got it yet, so it's wait and see though I hadn't really observed anything like in your video.
This is real crappy. How do we get Samsung to take note of this. RMA?