Window not Restore from taskbar

[Gilfoylex]

• .NET Core Version:3.1
• Windows version: Windows10
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? If yes, please file the issue via the instructions here.

• Security issues and bugs should be reported privately, learn more via our responsible disclosure guidelines.

  Problem description: My App have three window: MainWindow WindowA WindowB, WindowB.Owner = WindowA, WindowA.Owner = MainWindow, when I run this app in Adminstrator mode, First I click on the minimize button to minimize the MainWindow(WindowA and WindowB also minimize )， then I click icon in taskbar, MainWindow cannot be restored。if run this app in Normal mode (not Administrator), everything is Ok.

  Actual behavior: Clicking on the taskbar icon window does not respond

  Expected behavior: Window display restored

  Minimal repro:

  public partial class MainWindow : Window
  {
      public MainWindow()
      {
          InitializeComponent();
          Loaded += MainWindow_Loaded;
      }
  
      private WindowA _windowA = null;
      private WindowB _windowB = null;
      private void MainWindow_Loaded(object sender, RoutedEventArgs e)
      {
          _windowA = new WindowA();
          _windowA.Owner = this;
          _windowA.Show();
          _windowB = new WindowB();
          _windowB.Owner = _windowA;
          _windowB.Show();
      }
  }

[ClosetBugSlayer]

I can duplicate this problem at will in .NET 5, and it's been a bug since NET Framework 4.*. It happens when I try to persist a window as minimized then set it to minimized as soon as possible on launch. I can never restore it again unless I explicitly select the Restore item on the window's system menu; clicking the Taskbar button produces nothing,

[Gilfoylex]

I can duplicate this problem at will in .NET 5, and it's been a bug since NET Framework 4.*. It happens when I try to persist a window as minimized then set it to minimized as soon as possible on launch. I can never restore it again unless I explicitly select the Restore item on the window's system menu; clicking the Taskbar button produces nothing,

It may not be a wpf problem, I tried using the win32 api to reproduce the problem, the main window minimises its sub-windows only when the main window is minimised, the sub-windows of the sub-windows cannot be minimised.