The default LaTeX template does not work with multiple authors

[yihui]

A minimal reproducible example:

---
title: "R Markdown v2 Demo"
author:
  - John
  - Joe
date: "2015/01/01"
output:
  pdf_document:
    keep_tex: yes

---

Hello world.

The error message:

! Misplaced \crcr.
\endtabular ->\crcr 
                    \egroup \egroup $\egroup 
l.71 \maketitle

I have no idea what this means. Perhaps @robjhyndman can help again? Thanks!

[github-actions]

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