tufte_html does not output `nocite` citations at the end of document

[mbacou]

Hi, I have an Rmd document with the following front matter. Using output: tufte_html fails to output any citation at the end of the document. The same yaml works using output: html_document() or with link-citations: no.

---
title: "Business-oriented Typology and Characterization of Agriculture in SSA"
subtitle: A multi-scale and cross-time framework
author: '[Melanie Bacou](http://github.com/mbacou)'
date: "Last updated on `r Sys.Date()`. DRAFT, DO NOT USE OR CITE."
output:
  tufte::tufte_html:
    tufte_variant: envisioned  
    toc: yes
    toc_depth: 2
df_print: paged
fig_caption: yes
fig_height: 5
bibliography: biblio.bib
csl: apa.csl
link-citations: yes
nocite: |
  @aasr_2016, @alvarez2014typology, @jayne2015agdev, @hazell2013urban, @douillet2014developing, @jordan2005eth, @omamo2006strategic, @bacou2015ethseg, @omamo2006strategic, @benin2016agricultural, @willy2015adaptation, @jayne2015africafarmland, @diao2017ghana
---