SwiftUI: ListViews inside TabBar inside NavigationView生成空视图

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            TabView {
                Tab1View()
                    .tabItem {
                        Image(systemName: "list.bullet")
                        Text("Tab 1")
                    }
                
                Tab2View()
                    .tabItem {
                        Image(systemName: "square.grid.2x2")
                        Text("Tab 2")
                    }
            }
        }
    }
}

struct Tab1View: View {
    var body: some View {
        List {
            Text("Item 1")
            Text("Item 2")
            Text("Item 3")
        }
        .navigationBarTitle("Tab 1")
    }
}

struct Tab2View: View {
    var body: some View {
        List {
            Text("Item A")
            Text("Item B")
            Text("Item C")
        }
        .navigationBarTitle("Tab 2")
    }
}

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