[Problem/Bug]: WebView2CompositionControl off line with Task Scheduler

[merco]

What happened?

In a WPF .Net core8 application I'm using WebView2 (with a fixed version in a known path) to show OpenGL content and get canvas screenshot.

If I run the task with user interaction it runs ok=> I can see the WPF window and all the tasks steps.

If I run the task without user interaction (both with highest privileges and not) I get this error in event viewer:

Application: WpfAppDemo.exe
CoreCLR Version: 8.0.123.58001
.NET Version: 8.0.1
Description: The process was terminated due to an unhandled exception.
Exception Info: System.UnauthorizedAccessException: Accesso negato.

at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
at WinRT.BaseActivationFactory._ActivateInstanceI
at WinRT.ActivationFactory`1.ActivateInstanceI
at Windows.UI.Composition.Compositor..ctor()
at Microsoft.Web.WebView2.Wpf.WebView2CompositionControl.WebView2CompositionControl_Loaded(Object sender, RoutedEventArgs e)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)
at System.Windows.Interop.HwndTarget.OnResize()
at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

133.0.3065.95

SDK Version

1.0.3124.44

Framework

WPF

Operating System

Windows 10

OS Version

22H2 19045.5608

Repro steps

WPF version, net8.0-windows

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

No, this never worked

Last working version (if regression)

No response

[merco]

Could it be that it needs a window handle that is perhaps not available when the task manager is not running interactively with the user?

In these cases how can I make my content offscreen to fetch the canvas image bytes (I'm using threejs to display a 3D model) ?