Enum DependencyProperties fail in Hot Reload

Describe the bug

When a dependency property is an enum and bound to the UI - during live running of the app, any change made to the enum is accepted correctly, but the UI fails (control assumes that property is now null) and the IDE says it cannot convert the enum to a valid entry.

Error message in logs:
Exception thrown at 0x7598A942 in Heic Viewer.exe: Microsoft C++ exception: Microsoft::VisualStudio::DesignTools::UwpTap::LiveMarkup::LiveMarkupError at memory location 0x0077E4DC

Steps to reproduce the bug

public enum MyEnum
{
OptionOne,
OptionTwo,
OptionThree
}

public class MyCustomControl : Control
{
public static readonly DependencyProperty MyEnumProperty =
DependencyProperty.Register(
nameof(MyEnum),
typeof(MyEnum),
typeof(MyCustomControl),
new PropertyMetadata(MyEnum.OptionOne)
);

public MyEnum MyEnum
{
    get { return (MyEnum)GetValue(MyEnumProperty); }
    set { SetValue(MyEnumProperty, value); }
}

public MyCustomControl()
{
    this.DefaultStyleKey = typeof(MyCustomControl);
}

}

Expected behavior

As we don't have a visual designer, the expected behavour is that the live hot reload works, allowing changes to the code/xaml to not require a "close app", recompile, deploy, and run, to test changes.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5.5: 1.5.240627000

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

No repository files or tests are named. Start by reproducing the enum DependencyProperty case from the issue in a WinUI 3 app on Windows App SDK 1.5.5, then trace the Hot Reload/live markup path associated with the reported LiveMarkupError. Done means enum edits are applied without the UI treating the property as null or reporting a conversion error.