When changing value from inherited to the default one, control doesn't raise any property changed events

[maxkatz6]

Describe the bug

When changing value from inherited to the default one, control doesn't raise any property changed events.

To Reproduce
Steps to reproduce the behavior:

In ValueStoreTests_Inheritance.cs

[Fact]
public void Child_Notifies_About_Setting_Back_To_Default_Value()
{
    var parent = new Class1();
    var child = new Class1();

    parent.Foo = "changed";
    child.Parent = parent;

    bool raised = false;
    child.PropertyChanged += (_, args) =>
    {
        raised = args.Property == Class1.FooProperty && args.GetNewValue<string>() == "foodefault";
    };
    
    Assert.Equal("changed", child.Foo); // inherited from parent.

    child.Foo = "foodefault"; // reset back to default.
    Assert.True(raised); // expect event to be raised, as actual value was changed.
}

Expected behavior

Control notifies about changing its value from inherited to the default.

Desktop (please complete the following information):

• OS: any
• Version 11.0.0-preview5, master

Additional context

Reported here #10201 (comment)