Missing shortcode when used as first item in list-table

I have:

• searched the issue tracker for similar issues
• installed the latest version of Quarto CLI
• formatted my issue following the Bug Reports guide

Bug description

Hello,

this is a follow-up of https://github.com/pandoc-ext/list-table/issues/14 .

When using the list-table extension and placing a shortcode as first item in the table, then it get's mixed with the table styling syntax of list-table.

Steps to reproduce

---
title: Untitled
format:
  pdf: default
filters:
  - pandoc-ext/list-table
author: me
date: last-modified
---

- {{< meta title >}} Title is there      

:::{.list-table}
* - {{< meta title >}} Title is missing      
* - The title {{< meta title >}} is there
:::

Actual behavior

The first occurence of the shortcode in the table is missing.

The reason is that a Span can be also used to tweak the style of the table and while handling this it gets moved to the attributes of the table.

[BulletList [[Plain [Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","2")]) [],Space,Str "Fancy",Space,Str "Latex",Space,Str "missing"]]]]
[Plain [Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","2")]) [],Space,Str "Fancy",Space,Str "Latex",Space,Str "missing"]]
[BulletList [[Plain [Str "From",Space,Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","3")]) [],Space,Str "to",Space,Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","4")]) []]]]]
[Plain [Str "From",Space,Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","3")]) [],Space,Str "to",Space,Span ("",[],[("__quarto_custom","true"),("__quarto_custom_type","Shortcode"),("__quarto_custom_context","Inline"),("__quarto_custom_id","4")]) []]]

Expected behavior

No response

Your environment

MacOS 15.7.1

Quarto check output

Quarto 1.8.25
[✓] Checking environment information...
Quarto cache location: /Users/becker/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
Pandoc version 3.6.3: OK
Dart Sass version 1.87.0: OK
Deno version 2.3.1: OK
Typst version 0.13.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
Version: 1.8.25
Path: /Applications/quarto/bin

[✓] Checking tools....................OK
TinyTeX: v2024.09
Chromium: (not installed)

[✓] Checking LaTeX....................OK
Using: TinyTex
Path: /Users/becker/Library/TinyTeX/bin/universal-darwin
Version: 2024

[✓] Checking Chrome Headless....................OK
Chrome: (not detected)

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
Version: 3.13.7
Path: /opt/homebrew/opt/python@3.13/bin/python3.13
Jupyter: (None)

  Jupyter is not available in this Python installation.
  Install with python3 -m pip install jupyter

[✓] Checking R installation...........(None)

  Unable to locate an installed version of R.
  Install R from https://cloud.r-project.org/

Start by reproducing the provided .qmd example with the Quarto CLI and the pandoc-ext/list-table filter, then inspect the list-table handling of the first table item and its shortcode Span. Done means the shortcode in the first list-table item is preserved and rendered consistently with the other shortcode occurrences.