COMException in IVectorMethods`1.Append

[Marv51]

In production, reported via AppCenter, I get a COMException with HRESULT E_FAIL in a method creating a MenuFlyout. I have pasted a shortened version below:

private MenuFlyout CreateZoneContextMenu(Zone zone)
{
      var cmenu = new MenuFlyout();
      
      var mpaste = new MenuFlyoutItem() { Text = "Paste" };
      cmenu.Items.Add(mpaste);
      
      cmenu.Items.Add(new MenuFlyoutSeparator());
      
      var m3 = new MenuFlyoutItem() { Text = "Combine" };
      cmenu.Items.Add(m3);

      return cmenu;
}

The exception stack is:

System.Runtime.InteropServices.COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
  at WinRT.DelegateExtensions.DynamicInvokeAbi(Delegate del, Object[] invoke_params)
  at ABI.System.Collections.Generic.IVectorMethods`1.Append(IObjectReference obj, T value)
  at MyApp.CreateZoneContextMenu(Zone zone)

This occured on Windows 10.0.19044, I do not know if other versions are also effected.

This works fine on my PC, I have never reproduced it and honestly don't even know where I would start reproducing this. And it works also for the majority of users and invocations.

The only reason I could image for an Append to a Vector to fail, is maybe an out of memory situation? Does that sound plausible to you?

Expected behavior

I don't expect a C# call to an .Add( method to throw an exception.

Version Info

Windows App SDK / WinUI 3.0 (packaged) 1.0.3

Original AppCenter Crash report (click to expand)

OS: WINDOWS
Windows: 10.0.19044
Date: 2022-05-19T12:00:42.0898593Z

Exception Stack:
System.Runtime.InteropServices.COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
  at WinRT.DelegateExtensions.DynamicInvokeAbi(Delegate del, Object[] invoke_params)
  at ABI.System.Collections.Generic.IVectorMethods`1.Append(IObjectReference obj, T value)
  at Telani.Modern.View.ZoneRenderer.CreateZoneContextMenu(Zone zone, ZoneArea zonearea)
  at Telani.Modern.View.ZoneRenderer.PaintZone(Zone zone, Panel container)
  at Telani.Modern.View.ZoneRenderer.RepaintZones()
  at Telani.Modern.View.DrawingCanvas.Poly_PreviewMouseUp(Object sender, PointerRoutedEventArgs e)
  at ABI.Microsoft.UI.Xaml.Input.PointerEventHandler.Do_Abi_Invoke(IntPtr thisPtr, IntPtr sender, IntPtr e)
  at WinRT.ExceptionHelpers.<ThrowExceptionForHR>g__Throw|20_0(Int32 hr)
  at ABI.Windows.ApplicationModel.Core.IUnhandledErrorMethods.Propagate(IObjectReference _obj)
  at Windows.ApplicationModel.Core.UnhandledError.Propagate()
  at Microsoft.AppCenter.Utils.ApplicationLifecycleHelperWinUI.<.ctor>b__1_1(Object sender, UnhandledErrorDetectedEventArgs eventArgs)