INavigationAware async methods do not run on UI synchronization context

[elliot-gawthrop]

Describe the bug

The framework invokes the INavigationAware callbacks through a Task.Run, which causes the callbacks to be run on the thread pool.

Any cross-thread exceptions that do occur within the callback are silently swallowed because the result of the task is discarded.

To Reproduce

Add the following code to an INavgiationAware callback:

if (Thread.CurrentThread != Application.Current.Dispatcher.Thread)
{
    Debugger.Break();
}

Expected behavior

As this interface is intended to be implemented by view models, I expect the callbacks to be run on the UI synchronization context, allowing UI-bound properties to be modified without having to deal without posting the updates to the UI synchronization context manually.

Screenshots

No response

OS version

Windows 10

.NET version

.NET 9

WPF-UI NuGet version

4.0.0-rc.3

Additional context

No response