SwiftUI绑定不适用于子层次结构

我需要在一个孩子的一个孩子超时后刷新ContentView。由于某些原因，此代码不起作用：

struct ContentView: View {
    @State private var returnToHome: Bool = false

    var body: some View {
        TabView([
            TabBarItem(view: HomeView(),
                       image: Image("home_icon"),
                       title: "home"),
            TabBarItem(view: AskView(returnToHome: self.$returnToHome),
                       image: Image("ask_icon"),
                       title: "ask us"),
            TabBarItem(view: JobsView(),
                       image: Image("jobs_icon"),
                       title: "jobs"),
            TabBarItem(view: MeetingView(),
                       image: Image("meeting_icon"),
                       title: "meeting"),
            TabBarItem(view: MoreView(),
                       image: Image("more_icon"),
                       title: "more")
        ])
    }
}

struct AskView: View {
    @Binding var returnToHome: Bool

    var body: some View {
        AskDone(returnToHome: self.$returnToHome)
    }
}

struct AskDone: View {
    @Binding var returnToHome: Bool

    var body: some View {
            Text("done!")
        }
        .onAppear {
            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
                self.returnToHome = true
            }
        }
    }
}

执行了DispatchQueue中的代码，但它不会影响ContentView @State。我也尝试通过Binding，但是没有成功。可能是什么问题？