NavigationViewActiveIssue.swift

struct ContentView: View {
    @State var tab = 0
    @State var selections: [Int:Int] = [:]

    var body: some View {
        ZStack {
            TabView(selection: $tab) {
                NavigationView {
                    PageView(n: 0, selections: $selections)
                }.navigationViewStyle(StackNavigationViewStyle()).tabItem { Text("Pages") }.tag(0)

                Text("Second").tabItem { Text("Second") }.tag(1)
            }

            VStack {
                Text("Selections: \(selections.description)")
                HStack {
                    Button(action: {
                        if let last = self.selections.keys.sorted().last {
                            self.selections.removeValue(forKey: last)
                        }
                    }) {
                        Text("Pop")
                    }

                    Button(action: {
                        if let last = self.selections.keys.sorted().last {
                            self.selections[last+1] = Int.random(in: 0..<10)
                        } else {
                            self.selections[0] = 0
                        }
                    }) {
                        Text("Push")
                    }
                }
            }
            .padding(8)
            .background(Color(UIColor.systemGray3).cornerRadius(8))
            .frame(maxHeight: .infinity, alignment: .bottom)
            .padding(.bottom, 100)
        }
    }
}

struct PageView: View {
    let n: Int
    @Binding var selections: [Int:Int]

    var body: some View {
        List {
            ForEach(0..<10) { i in
                NavigationLink(destination: PageView(n: n+1, selections: $selections), isActive: isActive(i)) {
                    Text("\(i)")
                }
            }
        }
    }

    func isActive(_ i: Int) -> Binding<Bool> {
        Binding(get: {
            self.selections[self.n] == i
        }, set: {
            self.selections[self.n] = $0 ? i : nil
        })
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}