It’s a really cool discovery, but I don’t know how Apple is suppose to program against it.
What surprises me is how much of a time range each photo has to work with. Enough time for Tessa to put down one arm and then the other. It’s basically recording a mini-video and selecting frames from it. I wonder if turning off things like Live Photo (which retroactively starts the video a second or two before you actually press record) would force the Camera app to select from a briefer range of time.
Maybe combining facial recognition with post processing to tell the software that if it thinks it’s looking at multiple copies of the same person, it needs to time-sync the sections of frames chosen for the final photo. It wouldn’t be foolproof, but it would be better than nothing.