The style file does not carry an id. I believe that is the reason why Zotero does not want to load it. You can type there anything and Zotero loads. But also, the content of the file can be copied to Zotero's style editor. There, it works. Zotero produces the expected output.

I am using Zotero 5.0.96.2 and Pandoc 2.14.1.

On Wednesday, September 1, 2021 at 5:15:03 PM UTC+3 Bastien Dumont wrote:
For me too, although the style appears to be valid once you replace the slash by an underscore and can be used in the CSL style editor (https://editor.citationstyles.org/codeEditor/).

Le Wednesday 01 September 2021 à 02:07:29PM, denis...-NSENcxR/0n0@public.gmane.org a écrit :
> Just a side-issue: Checking your style with https://validator.citationstyles.org/ gives me three errors though on "title-bib/cit". Probably not related, but anyway.
>
> FWIW, I've tried to cross-check with Zotero, but Zotero refuses to install your style at all...
>
> > -----Ursprüngliche Nachricht-----
> > Von: pandoc-...@googlegroups.com <pandoc-...@googlegroups.com>
> > Im Auftrag von Bastien DUMONT
> > Gesendet: Mittwoch, 1. September 2021 16:02
> > An: pandoc-...@googlegroups.com
> > Betreff: Re: Fwd: CSL: conditional text not printed
> >
> > Hm, sorry, I can't see what could be wrong here. The problem may come from
> > the fact that the disambiguation code is triggered in subsequent citations (not
> > in the bibliography, since the entries will be not be formatted in the same way
> > there). If it is true, you've found a bug, but I may have missed something.
> >
> > Le Wednesday 01 September 2021 à 06:28:57AM, Hakan Dağdelen a écrit :
> > > Thanks a lot for the promt relpy.
> > >
> > > I call it under citation and bibliography layout. Here is my CSL file:
> > > https:// pastebin.com/MdzdZLXs
> > >
> > > Here is a bib file in json: https://pastebin.com/GgWeVU1x
> > >
> > > And here is a bib file in tex: https://pastebin.com/YUb73afz
> > >
> > >
> > >
> > > On Wednesday, September 1, 2021 at 3:28:38 PM UTC+3 Bastien Dumont
> > wrote:
> > >
> > > How do you call this macro? Could you provide a CSL file including it and a
> > > small example where it should be triggered? Normally it should work: see
> > > the related test in citeproc's test suite: [1]https://github.com/jgm/
> > > citeproc/blob/1ce8c26a5918c641b6a70d4b4151c7a51ab9a1ed/test/csl/
> > > disambiguate_ByCiteDisambiguateCondition.txt
> > >
> > > Le Wednesday 01 September 2021 à 03:09:14PM, hakan a écrit :
> > > > Hi,
> > > >
> > > > I have the following macro in my CSL style file:
> > > >
> > > >    <macro name="disambiguate">
> > > >      <choose>
> > > >        <if disambiguate="true">
> > > >          <text variable="title-short"/>
> > > >        </if>
> > > >      </choose>
> > > >    </macro>
> > > >
> > > > I use this macro in subsequent citations and bibliography. It helps me
> > > > to disambiguate works of authors cited with multiple works in citations
> > > > and to add a short title information at the end of the relevant
> > > > bibliography entries.
> > > >
> > > > When I convert org or tex documents with Pandoc, this macro is ignored
> > > > and nothing gets printed at the relevant positions. I tried both
> > > > CSL-json and biblatex files as bibliography files. Shorttitle fields are
> > > > filled in.
> > > >
> > > > How can I have this CSL macro work with Pandoc?
> > > >
> > > > Thanks a lot in advance.
> > > >
> > > > Hakan
> > > >
> > > >
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> > > d/msgid/
> > > > pandoc-discuss/
> > > > CAL9QFNmVq0NzALJEQe1GCC%2BuFBBT-%3Df_orrFTiFUBok-
> > BS%3D6yw%[3]
> > > 40mail.gmail.com.
> > > >
> > > > References:
> > > >
> > > > [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > > > [2] [4]https://groups.google.com/d/msgid/pandoc-discuss/
> > > CAL9QFNmVq0NzALJEQe1GCC%2BuFBBT-%3Df_orrFTiFUBok-
> > BS%3D6yw%40mail.gmail.com?
> > > utm_medium=email&utm_source=footer
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> > > [6]https://groups.google.com/d/msgid/
> > > pandoc-discuss/635d04e9-a938-4e2d-8ac0-
> > 81988c8402acn%40googlegroups.com.
> > >
> > > References:
> > >
> > > [1]
> > >
> > https://github.com/jgm/citeproc/blob/1ce8c26a5918c641b6a70d4b4151c7a51
> > > ab9a1ed/test/csl/disambiguate_ByCiteDisambiguateCondition.txt
> > > [2] https://groups.google.com/d/msgid/
> > > [3] http://40mail.gmail.com/
> > > [4]
> > > https://groups.google.com/d/msgid/pandoc-
> > discuss/CAL9QFNmVq0NzALJEQe1G
> > > CC%2BuFBBT-%3Df_orrFTiFUBok-
> > BS%3D6yw%40mail.gmail.com?utm_medium=email
> > > &utm_source=footer [5]
> > > mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > > [6]
> > > https://groups.google.com/d/msgid/pandoc-discuss/635d04e9-a938-4e2d-8a
> > > c0-
> > 81988c8402acn%40googlegroups.com?utm_medium=email&utm_source=foote
> > r
> >
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