Parent of Nested SocialClass not extracted

[alliyya]

From entry: younma

<CLASS SOCIALRANK="LOWER-MIDDLECLASS">
                                <CLASS SOCIALRANK="PROFESSIONAL">middling ranks</CLASS>
</CLASS>,

results in only professional extracted:

data:yongch_ReligionContext_1_describing a cwrc:ReligionContext ;
    rdfs:label "Charlotte Yonge - Religion Context (describing)" ;
    cwrc:contextFocus <https://commons.cwrc.ca/orlando:74cc42ea-182a-40ac-904d-de8d6bc53d4a> ;
    cwrc:hasIDependencyOn data:yongch_ReligionContext_1_identifying ;
    cwrc:nationalHeritage "ISO-3166-2:GB-ENG"^^xsd:string ;
    cwrc:religion cwrc:anglicanism ;
    cwrc:religionSelfReported cwrc:anglicanism ;
    cwrc:socialClass cwrc:professional ;
    oa:hasTarget _:N407b796af8d64d5cbeb894f02d4fb75b ;
    oa:motivatedBy oa:describing ;
    org:memberOf <https://commons.cwrc.ca/orlando:01db7e05-b55a-44c6-94bb-cbf6286abd18> .