SwiftUI/PlatformDocument_Mac.swift:13: Fatal error: Expected subclass override

I'm trying to use the Environment newDocument function in the latest SwiftUI and getting this error when I attempt to create the document. Has anyone else seen this?

I have and in the same boat can’t seem to find a solution around it, also I don’t understand why it’s macOS only, this api should work on iOS and macOS because they didn’t state in WWDC that this api is macOS only

Same problem here.

Same there

SwiftUI/PlatformDocument_Mac.swift:13: Fatal error: Expected subclass override
 
 
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