KCLS Bibliocommons generates unusable tags
                    KCLS (giant library system spanning cities around Seattle) switched to Bibliocommons some time ago.  On a MARC record that contains this:
650 0 $aSleep$vPopular works.$0(DLC)602181
Zotero (5.0.37) turns that into two tags: "Popular works.$0(DLC)602181" and "Sleep"
Presumably, it should have been one tag, something like "Sleep -- Popular works." Or at least, certainly the "$0(DLC)602181" should not be there. What can I do to help get this fixed?
                
                            650 0 $aSleep$vPopular works.$0(DLC)602181
Zotero (5.0.37) turns that into two tags: "Popular works.$0(DLC)602181" and "Sleep"
Presumably, it should have been one tag, something like "Sleep -- Popular works." Or at least, certainly the "$0(DLC)602181" should not be there. What can I do to help get this fixed?
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Relevant MARC specs (650 and control subfields):
https://www.loc.gov/marc/bibliographic/bd650.html
https://www.loc.gov/marc/bibliographic/ecbdcntf.html
GitHub BiblioCommons code:
http://tiny.cc/GitZoteroBiblioCommonsJS
GitHub marc.js:
https://github.com/zotero/translators/blob/master/MARC.js
https://kcls.bibliocommons.com/item/show/1393605082?active_tab=bib_info