`BinaryStringValue.Value` is not saved

[jiwonz]

RobloxFiles.BinaryStringValue mapData = new()
{
    Name = "test",
    Value = Encoding.UTF8.GetBytes("TEST"),
    Parent = bin,
};
bin.Save("test.rbxm");

If you check this saved rbxm with lune(rbx-dom), there is no value(empty string), and if you save it as xml so that you can view it with a text editor, the Value property itself is not included.