As some users have reported, the new iPhone 13 models have troubles with the Unlock with Apple Watch feature that was introduced with iOS 14.5. Apple is aware of the issue and iOS 15.1 beta 2 already contains a fix for it.
For now Apple recommends that you disable the feature and use a passcode unlock while waiting for version 15.1. Unfortunately, it’s not clear yet when it will graduate from beta. Especially since the fix requires watchOS 8.1 to be running on the your Watch and that is currently in beta 1.
iOS 15.1 will enable SharePlay, which was disabled in iOS 15 beta 6 (on iPadOS, tvOS and macOS as well). SharePlay is a way to remotely watch and listen to streaming content with your friends – it synchronizes play and also runs a group video call so that the group can chat.
The new version of the OS also contains another important feature for the current situation – it allows you to add your COVID-19 vaccination card to the Apple Wallet app.