It does seems there's a little bug with this; for in-footnote citation
outputs, but the second not.

Body text with a citation: [cite:@mcneill2011 with a suffix][fn:2].

Body text with a citation: [cite:@low2001; @mcneill2011; with a suffix][fn:3].

On Mon, Sep 6, 2021 at 7:50 AM Bruce D'Arcus <bdarcus@gmail.com> wrote:
>
> This works fine for me:
>
> #+bibliography: test.bib
> #+cite_export: biblatex verbose
>
> Body text with a citation: [cite:@mcneill2011].
>
> Footnote: [fn:1]
>
> #+print_bibliography:
>
> * Footnotes
>
> [fn:1] A commentary, and then a citation: [cite:@low2001].
>
> Results for the end is:
>
> Body text with a citation: \autocite{mcneill2011}.
>
> Footnote: \footnote{A commentary, and then a citation: \autocite{low2001}.}
>
> On Mon, Sep 6, 2021 at 6:04 AM Elias Bounatirou
> <elias.bounatirou@gmail.com> wrote:
> >
> > Hello,
> > I tried to insert a citation in a footnote using Org-ref-cite. Unfortunately, when exporting to  LaTeX, the citation is ignored, i.e., it is left out and does not appear in the LaTeX output. Is there a way to make references appear in the footnotes or is there at least a work around? The footnote itself in my case was created by C-c C-x f.
> > I am writing to the list, following John Kitchin's advice, who supposes that the problem might be a limitation in Org-cite, see also my github issue https://github.com/jkitchin/org-ref-cite/issues/22.
> > I am using Org-mode to write a book on a linguistic subject and I absolutely (desperately!) need footnotes with references in them. Therefore, if the functionality in question does not exist, my mail is also a feature request to create it.
> > Many thanks for your help.
> >
> > Elias
> >
> > (org-version)
> > "9.4.6"
> > (emacs-version)
> > "GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
> >  of 2021-06-04"