Javascript objects defined in .NET don't Stringify correctly about jurassic HOT 4 CLOSED

public class MyJsObjectInstance : ObjectInstance
{
    public MyJsObjectInstance(ObjectInstance prototype) : base(prototype)
    {
        // No need to call PopulateFunctions().
        MyString = "This is my string";
    }

    public string MyString
    {
        get { return this["myString"]; }
        set { this["myString"] = value; }
    }
}

public class MyJsObjectInstance : ObjectInstance
{
    private string myString;

    public MyJsObjectInstance(ObjectInstance prototype) : base(prototype)
    {
        this.PopulateFunctions();
        this.myString = "This is my string";
    }

    [JsProperty(Name = "myString", IsEnumerable = true)]
    public string MyString
    {
        get { return this.myString; }
        set { this.myString = value; }
    }
}

public class MyJsObjectInstance : ObjectInstance
{

    private string mySecondString;

    public MyJsObjectInstance(ObjectInstance prototype)
        : base(prototype)
    {
        this.PopulateFunctions();
        this.PopulateFields();
    }

    public MyJsObjectInstance(ObjectInstance prototype, int i)
        : base(prototype)
    {
        this.MyFirstString = "my first string";
        this.MySecondString = "my second string";
    }

    // Works fine
    public string MyFirstString
    {
        get { return (string)this["myFirstString"]; }
        set { this["myFirstString"] = value; }
    }

    // Does not show up in JSON.stringify()
    [JSProperty(Name = "mySecondString", IsEnumerable = true)]
    public string MySecondString
    {
        get { return this.mySecondString; }
        set { this.mySecondString = value; }
    }
}