SwiftUI: Problems with List inside TabViews inside NavigationView

Question

I want to place a TabView inside a NavigationView with different titles depending on the selected tab. Inside those tabs I want to place a List view. See the code below:

 struct ContentView: View {
 @State private var selection = 1
 
 var body: some View {
     TabView(selection:$selection) {
         Page_1()
             .tabItem {
                 Image(systemName: "book")
                 Text("Page 1")
             }
             .tag(1)
         
         Page_2()
             .tabItem {
                 Image(systemName: "calendar")
                 Text("Page 2")
             }
             .tag(2)  
     }
   }
 }


 struct Page_1: View {
    @State var selectedTab = "1"
 
    var body: some View {
        NavigationView {
            TabView(selection: $selectedTab) {
                List {
                    ForEach(0..<20){i in
                        Text("Test")
                    }
                }
                .tag("1")
                .navigationBarTitle("Page 1 Tab 1")
             
                List {
                    ForEach(0..<20){i in
                        Text("Test")
                    }
                }
                .tag("2")
                .navigationBarTitle("Page 1 Tab 2")
            }
            .tabViewStyle(.page(indexDisplayMode: .never))
            .ignoresSafeArea(.all)
            .background()
        }
     }
 }


 struct Page_2: View {
    @State var selectedTab = "1"

    var body: some View {
       NavigationView {
        
          TabView(selection: $selectedTab) {
              List {
                ForEach(0..<20){i in
                    Text("Test")
                }
              }
              .tag("1")
              .navigationBarTitle("Page 2 Tab 1")
            
              List {
                 ForEach(0..<20){i in
                    Text("Test")
                 }
              }
              .tag("2")
              .navigationBarTitle("Page 2 Tab 2")
          }
          .tabViewStyle(.page)
          .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
          .ignoresSafeArea()
          .background()  
      }   
    }
 }

The problem is that when the Pages first appear the lists inside their TabViews seem to be placed slightly too low and then move up. You can see this especially when you switch tabs like here:

After switching back and forth between the tabs they are placed correctly until I freshly start the app again. Would really appreciate your help!:)

Edit

As suggested I tried to put the NavigationViews inside the TabView. That solves the problem with the wrong positioning. However, it leads to the views not being shown at all before I switch back and forth between them. You can see what that looks like in the picture below: