Getting "Cannot change thread mode after it is set" error in .NET 8 WinUI3 Single instance

[thecco]

I used a Google translator.
This is my wole code for .Net8 WinUI3 Single instance application.

.proj

<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
    <defineconstants>DISABLE_XAML_GENERATED_MAIN</defineconstants>
</PropertyGroup>

Program.cs

[global::System.Runtime.InteropServices.DllImport("Microsoft.ui.xaml.dll")]
[global::System.Runtime.InteropServices.DefaultDllImportSearchPaths(global::System.Runtime.InteropServices.DllImportSearchPath.SafeDirectories)]
private static extern void XamlCheckProcessRequirements();

[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.UI.Xaml.Markup.Compiler", " 3.0.0.2408")]
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.STAThreadAttribute]
static async Task<int> Main(string[] args)
{
    XamlCheckProcessRequirements();

    global::WinRT.ComWrappersSupport.InitializeComWrappers();
    bool isRedirect = await DecideRedirection();
    if (!isRedirect)
    {
        global::Microsoft.UI.Xaml.Application.Start((p) => {
            var context = new global::Microsoft.UI.Dispatching.DispatcherQueueSynchronizationContext(global::Microsoft.UI.Dispatching.DispatcherQueue.GetForCurrentThread());
            global::System.Threading.SynchronizationContext.SetSynchronizationContext(context);
            new App();
        });
    }

    return 0;
}

Custom Control

protected override void OnApplyTemplate()
{
    base.OnApplyTemplate();

    PART_WebView = (WebView2)GetTemplateChild(PART_WebViewName);
    PART_WebView.Loaded += PART_WebView_Loaded;
    PART_WebView.CoreWebView2Initialized += PART_WebView_CoreWebView2Initialized;

    Bridge.NewBridge(PART_WebView, this);
}

private async void PART_WebView_Loaded(object sender, RoutedEventArgs e)
{
    PART_WebView.Loaded -= PART_WebView_Loaded;

    CoreWebView2Environment environment = await CoreWebView2Environment.CreateWithOptionsAsync(null, Environment.ExpandEnvironmentVariables(App.GetService<ILocalSettingsService>().AppDataFolderPath), null);
    await PART_WebView.EnsureCoreWebView2Async(environment);

    this.Focus(FocusState.Programmatic);
}

I've already seen #202.
What should I do in my case?
Program.cs source code is copied from generated file (app.g.i.cs) and add only one line.
It works well when I delete program.cs
Of course, I have to give up on single instances as well.