multi-refs with multiref_no_duplicates: false creates duplicates within a bibliography

[zmbc]

Lightly edited sample.md:

---
multiref_no_duplicates: false
---

# A section header

## A subsection

Here is something [@ainsworth:sheppard 27]. Something else
[@dames:physiology]. Finally,[@dames:physiology] we want one[@dames:physiology] last[@dames:physiology] citation[@dames:physiology] [@kant:critique2 29]. Here, references for this subsection:

<div class="multi-refs"></div>

## Another subsection.

Something new [@altick:aldine 20]. And something repeated
[@dames:physiology].

<div class="multi-refs"></div>

# A second section

Here is something [@lukacs:european 125]. Something else
[@cohen:jokes 3]. Finally, one last
citation [@trollope:autobiography 392]. And something repeated in a different section: [@dames:physiology]

<div class="multi-refs"></div>

Command: pandoc --citeproc --lua-filter multi-refs.lua sample.md -o sample.docx --bibliography bibliography.bib --csl biomed-central.csl

Result:

Unless I have greatly misunderstood the expected behavior, the "Dames N" reference should not be repeated in the first bibliography.