The latest beta version of iOS 13 includes a new feature in FaceTime called Attention Correction, which subtly alters the image of your face in real time to make it look like you’re looking into the camera even when you’re looking down at the screen to see the other person.
As now the new feature only works on the newest generation of iPhone models, (Xs, Xs Max, and Xr) . So the new feature may require the A12 SoC, Apple’s newest processor chip.