In Noesis args are only valir during the lifetime of the event handler call. In order to perform any async operation that uses event arg members you'll have to copy them into variables:

static void ModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

{

...

object newValue = e.NewValue;

View.ExecuteOnLoad(fe, delegate

{

var target = newValue;

    d.SetValue(View.IsScopeRootProperty, true);

    var context = string.IsNullOrEmpty(fe.Name)
                      ? fe.GetHashCode().ToString()
                      : fe.Name;

    ViewModelBinder.Bind(target, d, context);
});
}

Could you please try that?

That works yes. It's still a bit problematic that this causes a crash

We are still not able to keep the DependencyPropertyChangedEventArgs alive if captured in an async method, but it is not crashing anymore as accessing its methods will return null values.