Problem with 7.2.26 update - failed to apply 1 star rating to an image

using (var losslessJpeg = new Aurigma.GraphicsMill.Codecs.LosslessJpeg(sourcePath))
{
	// IPTC
	if (losslessJpeg.Iptc == null)
	{
		losslessJpeg.Iptc = new Aurigma.GraphicsMill.Codecs.IptcDictionary();
	}
	// EXIF
	if (losslessJpeg.Exif == null)
	{
		losslessJpeg.Exif = new Aurigma.GraphicsMill.Codecs.ExifDictionary();
	}

	// XMP
	var xmp = new Aurigma.GraphicsMill.Codecs.XmpData();
	if (losslessJpeg.Xmp != null)
	{
		xmp.Load(losslessJpeg.Xmp);
	}
	//Remove the XmpRating tag if it is already exists
	if (xmp.Contains(Aurigma.GraphicsMill.Codecs.XmpTagNames.XmpRating))
	{
		xmp.Remove(Aurigma.GraphicsMill.Codecs.XmpTagNames.XmpRating);
	}
	var msRatingId = "MicrosoftPhoto:Rating";

	if (xmp.Contains(msRatingId))
	{
		hasMSRatingID = true;
		xmp.Remove(msRatingId);
	}
	//Add the XmpRating tag (simple value)
	var node = new Aurigma.GraphicsMill.Codecs.XmpValueNode(
		Aurigma.GraphicsMill.Codecs.XmpNodeType.SimpleProperty, "1",
		Aurigma.GraphicsMill.Codecs.XmpTagNames.XmpRating);
	xmp.AddNode(node);

	if (hasMSRatingID)
	{
		var node2 = new Aurigma.GraphicsMill.Codecs.XmpValueNode(
				   Aurigma.GraphicsMill.Codecs.XmpNodeType.SimpleProperty, "1",
				   msRatingId);
		xmp.AddNode(node2);
	}

	losslessJpeg.Xmp = xmp.Save();

	losslessJpeg.Write(tempPath);
}

System.IO.File.Delete(sourcePath);
System.IO.File.Move(tempPath, sourcePath);