The `master` branch includes support for ARKit 3, which is still in beta. While ARFoundation and ARSubsystems 2.2 _support_ ARKit 3, only Unity's ARKit XR Plugin 2.2 package contains _support_ for these features and _requires_ Xcode 11 beta and iOS 13 beta. Unity's ARKit XR Plugin 2.2 is not backwards compatible with previous versions of Xcode or iOS.
This table shows the latest version of the ARKit plugin and their Xcode and iOS compatibility:
This table shows the latest version of Unity's ARKit XR Plugin and its Xcode and iOS compatibility:
Tim Mowrer