As expected, the Xcode 14 release candidate reverts to the macOS 12 and Catalyst 15 SDKs. To get your Swift code compiling for both iOS and Mac:

#if canImport(RoomPlan)
// Use iOS 16 or macOS 13 API
#endif

It’s a bit more obvious in Objective-C:

#ifdef __IPHONE_16_0
// Use iOS 16 or macOS 13 API
#endif

We’ve been doing this since June so our code compiles with any of Xcode 13, Xcode 14 beta, and the Xcode 14 release candidate.