https://wccftech.com/face-id-on-iphone-13-disabled-with-original-screen-replacement/

Apple has doubled down on locking down third-party repairs with the iPhone 13 series launch by disabling Face ID when the original display is swapped out for a non-genuine part. However, if you replace the original screen with an authentic panel, too, iPhone 13’s facial recognition feature will refuse to work, making the situation a lot more painful.

A video posted by Phone Repair Guru showed that replacing the iPhone 13’s display with a non-genuine one would not just give the user a prompt that they had attached an unauthentic part, it would prevent Face ID from working. Assuming you did replace the panel on your own, and if you navigate into the ‘Settings’ menu in an attempt to set up Face ID, it will not function, meaning that Apple would be punishing you for attempting to perform third-party repairs.