Why does the body of FeatureView get recomputed when the alert is shown/dismissed? There is no @State on that view.

App.swift

@main
struct PreviewApp: App {
    var body: some Scene {
        WindowGroup {
            NavigationView {
                AlertContainer { route in
                    FeatureView(route: route)
                }
            }
            let _ = print(type(of: self), "body")
        }
    }
    
}

struct FeatureView: View {
    let route: Binding<String?>
    
    var body: some View {
        Button("Tap") {
            route.wrappedValue = "route"
        }
        let _ = print(type(of: self), "body")
    }
}

struct AlertContainer<C: View>: View {
    @State var route: String?
    @ViewBuilder let content: (Binding<String?>) -> C
    
    var body: some View {
        let _ = print(type(of: self), "body")
        content($route)
            .alert(isPresented: $route.hasValue(), content: {
                Alert(title: Text("Open \(String(describing: route))"))
            })
    }
}


extension Binding {
    func hasValue<T>() -> Binding<Bool> where Value == Optional<T> {
        .init {
            self.wrappedValue != nil
        } set: { newValue in
            if newValue == false {
                self.wrappedValue = nil
            }
        }
    }
}

Binding conforms to DynamicProperty so from SwiftUI tracking perspective its like State.