x:Bind with a converter not applicable for a Window XAML via C++/WinRT

[ACGNnsj]

Describe the bug

template <typename D, typename... I>
    IComponentConnector FormalOverlayT<D, I...>::GetBindingConnector(int32_t connectionId, IInspectable const& target)
    {
        ::winrt::com_ptr<::winrt::OCR::implementation::XamlBindings> bindings;
        switch (connectionId)
        {
            case 1: // FormalOverlay.xaml line 4
                {
                    auto element1 = target.as<::winrt::Microsoft::UI::Xaml::Window>();
                    auto objBindings = std::make_unique<FormalOverlay_obj1_Bindings>();
                    objBindings->SetDataRoot(*this);
                    objBindings->SetConverterLookupRoot(*this);
                    bindings = ::winrt::make_self<::winrt::OCR::implementation::XamlBindings>(std::move(objBindings));
                    Bindings = bindings;
                    element1.Activated({&*bindings, &::winrt::OCR::implementation::XamlBindings::Activated});
                }
                break;
        }
        return bindings ? bindings.as<::winrt::Microsoft::UI::Xaml::Markup::IComponentConnector>() : nullptr;
    }

void SetConverterLookupRoot(::winrt::Microsoft::UI::Xaml::FrameworkElement const& rootElement)
        {
            converterLookupRoot = rootElement;
        }

In the generated files, the root element of a XAML is arbitrarily assumed to be a FrameworkElement, which would definitely cause promblems in some cases.
Just like that in this report. #4966
I would like to know if there is a plan for solving this.

Steps to reproduce the bug

Here is my demo project.
FormalOverlay.xaml DoubleToThicknessConverter.idl DoubleToThicknessConverter.h

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.3.1: 1.3.230502000

Windows version

Windows Insider Build (xxxxx)

Additional context

No response