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Hello Alex,

Thanks for the quick reply. I took an unmodified pair of images (JPG and RW2) and stepped through the process of setting the GPS coordinates and then adding ratings to the image with FRV. The resulting XMP file that was created by FRV was consistent with your statement, it only contained the rating changes I made, there was no GPS data added to the XMP file by FRV.
So I need to go back to experiment with PhotoLab again, as it appears to be the faulty party. I was seeing some strange behavior with their filmstrip filter which might be part of the problem. 
If I find something that relates to FRV I'll post again.
Thanks for taking the time to provide the detailed reply,
Paul Fischer
p.s. This is the XMP file that FRV created for the JPG/RW2 image pair that included GPS data added via ExifTool:

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.6.0">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/">
         <xmp:Rating>1</xmp:Rating>
         <xmp:MetadataDate>2022-04-24T16:21:38-07:00</xmp:MetadataDate>
         <xmp:Label>Red</xmp:Label>
         <xmpMM:InstanceID>uuid:d874e788-25f8-4d1d-947a-6e77822b5d6a</xmpMM:InstanceID>
         <photoshop:SidecarForExtension>RW2</photoshop:SidecarForExtension>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>