A few days ago, iPhone 13 series shipping began and early users have already reported some issues. The issue is related to the Unlock with Apple Watch Feature on iPhone 13 units and iPhone 13 Pro units which are capping third-party animations at 60Hz. This issue exists even though the Pro models come with up to 120Hz refresh rate support. There is also a video that has surfaced showing how iPhone 13's screen repair via a third-party repair center causes Face ID to stop working.
Apple has acknowledged in a statement on their support page about possible problems that customers may face while using the Unlock with Apple Watch feature on the iPhone 13. It said that company is aware of the issue and is working toward fixing this issue in an upcoming software update. Some users may see an error that reads, ‘Unable to Communicate with Apple Watch' if they try to unlock their iPhone while wearing a face mask, or they might not be able to set up Unlock with Apple Watch.
Apple recommended users to turn off "Unlock with Apple Watch" for now and use the passcode method to unlock the iPhone 13 till the software update is released.
iPhone 13 Pro's ProMotion screen cannot exceed 60Hz refresh rate while on several third-party apps. While standard animations and scrolling interactions are automatically scaled up to 120Hz, Apple has reportedly confirmed that third-party developers will have to add a custom code to take full advantage of the 120Hz display on the Pro model. Apple told the publication that developers will need to add a new Info.plist key to opt-in, and documentation regarding that will be published soon. Apple claims that this third-party app opt-in process has been introduced for battery life reasons, reported by 9to5Mac.