Strange issue with NavigationView on iPad (SwiftUI)

Question

I have used NavigationView like this for iPhone and iPad, and in iPhone works fine. But for iPad, sometimes when enter a NavigationLink - it will go to the new view, then enter the same view again... and again for a few times!

NavigationView {
  WidgetEditor(widgetSize: $widgetSize)
    .navigationBarTitle("", displayMode: .inline)
    .toolbar {
      ToolbarItem(placement: .navigationBarLeading) {
        NavigationLink(destination: AppsView()) {
                        ...
        }
      }
                
      ToolbarItem(placement: .navigationBarTrailing) {
        NavigationLink(destination: HelpView()) {
          Image(systemName: "questionmark.circle")
        }
      }
   }
}
.navigationViewStyle(StackNavigationViewStyle())

I suspect it is the last line that cause the issue, but I need the NavigationView to looks like iPhone not dual panes. Any suggestions? Thanks in advance!