Failure to extract dc:description when the value is the node text

I can not get the dc:description from the following xmpmeta:
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 4.4.0">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:exif="http://ns.adobe.com/exif/1.0/">
<exif:UserComment>exif</exif:UserComment>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:description>from XnViewMP 0.26</dc:description>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>

But it works from this:
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 4.4.0-Exiv2">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:description>
<rdf:Alt>
<rdf:li xml:lang="x-default">dc:description</rdf:li>
</rdf:Alt>
</dc:description>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>

Both of them are valid according to http://www.w3.org/RDF/Validator/. My interpretation of http://dublincore.org/documents/dcmes-xml/ is that the first format should be ok for Dublin Core too.

See attached unit test.