Possible bug for textual citations? Extra author reference

[jkitchin]

In this code:

#+BEGIN_SRC bibtex :tangle test.bib
@article{kitchin-2015-examp,
  author =	 {Kitchin, John R.},
  title =	 {Examples of Effective Data Sharing in Scientific Publishing},
  journal =	 {ACS Catalysis},
  volume =	 {5},
  number =	 {6},
  pages =	 {3894-3899},
  year =	 2015,
  doi =		 {10.1021/acscatal.5b00538},
  url =		 { http://dx.doi.org/10.1021/acscatal.5b00538 },
  keywords =	 {DESC0004031, early-career, orgmode, Data sharing },
  eprint =	 { http://dx.doi.org/10.1021/acscatal.5b00538 },
}
#+END_SRC

#+BEGIN_SRC emacs-lisp :results code
(org-babel-tangle)

(defun render (csl-style data sentcase)
  (let* ((proc (citeproc-create csl-style
				(citeproc-hash-itemgetter-from-any "test.bib" sentcase)
				(citeproc-locale-getter-from-dir "../../../../org-ref/citeproc/csl-locales/")
				"en-US"))
	 (cites (list (citeproc-citation-create :cites data
						:mode 'textual
                                                  :suppress-affixes t
						:capitalize-first nil
						:suppress-affixes nil)))
	 (rendered-citations (progn (citeproc-append-citations cites proc)
				    (citeproc-render-citations proc 'org nil))))
    rendered-citations))


;; https://raw.githubusercontent.com/citation-style-language/styles/master/elsevier-harvard.csl
(render "elsevier-harvard.csl" '(((id . "kitchin-2015-examp")
				  (prefix . "See ")
				  (suffix . "")
				  (locator . "2")
				  (label . "page")
				  (suppress-author)))
	nil)
#+END_SRC

#+RESULTS:
#+begin_src emacs-lisp
("Kitchin See [[citeproc_bib_item_1][Kitchin, 2015, p. 2]]")
#+end_src

It appears there is an extra author (Kitchin) at the beginning of the output. I would have thought it should just be "See [[citeproc_bib_item_1][Kitchin, 2015, p. 2]]"

Is this a bug?