Visual Studio 2022 v17.12 does not update Binding to [ObservableProperty]

[bjorn-malmo]

Describe the bug

A WinUI custom control decorated with [ObservableObject] attribute will not update Bindings in the control's template for properties on property changed.

This does work in Visual Studio 2022 v17.10!
This does NOT work in Visual Studio 2022 v17.12!

Roslyn gang directed me here (dotnet/roslyn#76470)
Issue reported in Community Toolkit can reproduce, but closed as external (CommunityToolkit/dotnet#1011)

Steps to reproduce the bug

1. Create a WinUI 3 Custom Control
2. Using CommunityToolkit, attribute the class [ObservableObject]
3. Create a field and attribute it [ObservableProperty]

[ObservableObject]
public sealed partial class CustomControl1 : Control
{
    public CustomControl1()
    {
        this.DefaultStyleKey = typeof(CustomControl1);
    }

    [ObservableProperty] string _myValue = "Initial value";

    [RelayCommand]
    void UpdateValue()
    {
        MyValue = "Updated value";
    }
}

5. In the control's template, bind to the property

    <Style TargetType="local:CustomControl1" >
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:CustomControl1">
                    <StackPanel Spacing="16"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                        
                        <TextBlock Text="{Binding MyValue, RelativeSource={RelativeSource TemplatedParent}}"/>

                        <Button Content="Update value!" 
                                Command="{Binding UpdateValueCommand, RelativeSource={RelativeSource TemplatedParent}}"/>
                        
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

7. Update the value of the MyValue property.

Sample application found here: Project PropertyBindingTest.sln in repo https://github.com/bjorn-malmo/bug-free-happiness/

Run the application using Visual Studio 2022 v17.10 and click the button:

Run the same application using Visual Studio 2022 v17.12 and click the button:

Expected behavior

The Binding to update as a result of the change notification

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.6.3: 1.6.241114003

Windows version

Windows 11 (23H2): Build 22631

Additional context

No response