Segoe Fluent Icon unable to render when using binding on Windows 10

[HO-COOH]

Describe the bug

So on Windows 10, we cannot package Segoe Fluent Icon font directly in the package. So I wrote a font downloader which download and extract the font to application local folder. Then I update the FontFamily. But it seems that using {x:Bind} to bind to FontFamily will have issues rendering on windows 10. It renders as a block character. Directly setting FontFamily in xaml have no such issues.

Steps to reproduce the bug

1. Create a new WinUI3 Packaged project
2. Use this xaml

        <TextBlock Text="Set FontFamily to Segoe Fluent Icon in XAML" />
        <FontIcon FontFamily="ms-appdata:///local/Segoe%20Fluent%20Icons.ttf#Segoe Fluent Icons" Glyph="&#xE701;" />

        <TextBlock Text="Set FontFamily to Segoe MDL2 in XAML" />
        <FontIcon FontFamily="ms-appdata:///local/segmdl2.ttf#Segoe MDL2 Assets" Glyph="&#xE701;" />

        <TextBlock Text="Set FontFamily to Segoe Fluent Icon in binding" />
        <FontIcon FontFamily="{x:Bind FluentIconFont}" Glyph="&#xE701;" />

        <TextBlock Text="Set FontFamily to Segoe MDL2 in binding" />
        <FontIcon FontFamily="{x:Bind MDLIconFont}" Glyph="&#xE701;" />

Code behind

    winrt::Microsoft::UI::Xaml::Media::FontFamily GlyphsPage::FluentIconFont()
    {
        return winrt::Microsoft::UI::Xaml::Media::FontFamily{
            std::format(L"{}\\Segoe Fluent Icons.ttf#Segoe Fluent Icons", winrt::Windows::Storage::ApplicationData::Current().LocalFolder().Path())
        };
    }
    winrt::Microsoft::UI::Xaml::Media::FontFamily GlyphsPage::MDLIconFont()
    {
        return winrt::Microsoft::UI::Xaml::Media::FontFamily{
            std::format(L"{}\\segmdl2.ttf#Segoe MDL2 Assets", winrt::Windows::Storage::ApplicationData::Current().LocalFolder().Path())
        };
    }

3. Download and extract Segoe Fluent Icons.ttf to AppData\Local\Packages\{...id...}\LocalState
4. Build and run

Expected behavior

No response

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.6.1: 1.6.240923002

Windows version

Windows 10 (1809): Build 17763

Additional context

No response