Treaty author delimitation without "and" in Chicago

Hi all,

I've noticed a small issue in Chicago 18 (though it also seems to be present in 17):
Per CMOS 14.191, treaty signatories should be delimited using an en-dash (or a regular dash? it's inconsistent) without the use of "and", like so:
1. Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water, U.K.-U.S.-U.S.S.R., Aug. 5, 1963, 14 U.S.T. 1313.
(NB: Chicago diverges from the Bluebook here, which only uses signatory names for bilateral treaties to which the U.S. is party IIRC)
2. Agreement Concerning Civil Uses of Atomic Energy, U.S.–S. Kor., Feb. 3, 1956, T.I.A.S. No. 3490.
The Zotero style attempts this via the absence of and from the cs:name element:

<!-- 6.1. Legal author -->
<macro name="legal-author">
<names variable="author">
<name delimiter="-" form="short"/>
</names>
</macro>


Yet upon rendering, the citations nevertheless include "and":
1. Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water, U.K.-U.S.-and U.S.S.R., August 5, 1963, 14 U.S.T. 1313.
(NB: I've increased the et-al-min here)
Agreement Concerning Civil Uses of Atomic Energy, U.S. and S. Kor., August 5, 1963, T.I.A.S. No. 3490.
Seeing as and="text" is set within the style element, is there any actual way to fix this, or can it just be chalked up to a CSL issue? The only alternatives I can think of necessitate excessive if usage; yes, I know the obvious workaround would be to just put the dashed parties in a single author field, but where's the fun in that?
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