https://wccftech.com/iphone-13-screen-replacmeent-will-kill-face-id-completely-unprecedented-repair-restriction-from-apple/

Even though the iPhone 13 series launched with more or less the same design as that of its predecessor, it still brought amazing improvements. For instance, a larger battery and smaller notch with numerous camera improvements are just some of the major additions. However, the device is very expensive to repair. Moreover, if you replace the screen on your iPhone 13, you will break your Face ID. This is something that Apple does to restrict repairs from unauthorized sources.

While advocating for the Right to Repair, iFixit said in an article today that killing Face ID after replacing the iPhone 13 screen will have a major impact on companies that offer repairs. iFixit found the issue during the iPhone 13 Pro Max teardown and it confirmed it with various tests. If you perform a screen replacement on the iPhone 13 series, it will break Face ID. What this means is that face ID will no longer be functional and you will get a message "Unable to activate Fave IF on this iPhone."