in a new SwiftUI mac app project, paste below code

import SwiftUI

struct ContentView: View {
    @State private var path = [Int]()

    var body: some View {
        NavigationSplitView {
            NavigationLink {
                NavigationStack(path: $path) {
                    VStack {
                        Button("Show 1") {
                            path = [1]
                        }
                    }
                    .navigationDestination(for: Int.self) { selection in
                        Text("You selected (selection)")
                    }
                }
            } label: {
                Text("sidebar object")
            }
        } detail: {
            Text("detail")
        }
    }
}

run the project, then click the “sidebar object” button in sidebar, then click the “Show 1”, would somehow show a yellow warning mark, screenshot here

However, after asking some AI and twisting its code, I make it works just by surround Text(“detail”) with another NavigationStack, see below code:

import SwiftUI

struct ContentView: View {
    @State private var path = [Int]()

    var body: some View {
        NavigationSplitView {
            NavigationLink {
                NavigationStack(path: $path) {
                    VStack {
                        Button("Show 1") {
                            path = [1]
                        }
                    }
                    .navigationDestination(for: Int.self) { selection in
                        Text("You selected (selection)")
                    }
                }
            } label: {
                Text("sidebar object")
            }
        } detail: {
            NavigationStack {
                Text("detail")
            }
        }
    }
}

Can someone tell me what happen here? Is this the right way of doing things?

p.s. I used to use UIKit, and just trying to learn SwiftUI not long ago