Nice! As did you, I saw NavigationLink and spent most of an afternoon crashing my app in an attempt to get it to work.

Note the code can be cleaned up just a bit…

struct DetailView: View {
    var dismiss: PassthroughSubject<Void, Never>
    var body: some View {
        Button("Here are details. Tap to go back.") {
            self.dismiss.send()
        }
    }
}
struct RootView: View {
    var link: NavigationDestinationLink<DetailView>
    let linkDismissed = PassthroughSubject<Void, Never>()
    init() {
        self.link = NavigationDestinationLink(
            DetailView(dismiss: linkDismissed),
            isDetail: false
        )
    }
    var body: some View {
        VStack {
            Button("I am root. Tap for more details.") {
                self.link.presented?.value = true
            }
        }
        .onReceive(linkDismissed, perform: { _ in
            self.link.presented?.value = false
        })
    }
}

Subjects are reference types, so you can just hand the root subject directly to the detail view.

I wonder if this works for multiple pushed views? Hmmm….