Citations in lists sometimes cause error bad argument #2 to 'match' (string expected, got table)

[Witiko]

Citations in lists sometimes cause error bad argument #2 to 'match' (string expected, got table):

$ docker run --rm -it witiko/markdown

$ markdown-cli --version
markdown-cli.lua (Markdown) 3.6.1-17-gf57d31e7
Copyright (C) 2009-2016 John MacFarlane, Hans Hagen
Copyright (C) 2016-2024 Vít Starý Novotný, Andrej Genčur
License: LPPL 1.3c

$ markdown-cli citations=true <<-'EOF'
- Color export targets [@latexteam2024interfaces,
  Section 37.8]
EOF

...cal/texlive/texmf-local/tex/luatex/markdown/markdown.lua:4618: bad argument #2 to 'match' (string expected, got table)

The full reproducing document originates from Witiko/expltools#3, which is currently blocked by this ticket.

Tasks

• Add a reproducing test file issue-460.test from commit fc73190 in draft PR #461.
• Make the reproducing test file pass the CI.
• Update CHANGES.md.