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?
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