Possible LaTeX export bug: Footnotes in items

[Eric Anderson <kluwak@gmail.com>]

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Hi All,

I'm new to the developers' mailing list, so I hope this is the right place
to post potential bugs.  I don't claim to know exactly why, but at least
for certain TOC options, the LaTeX exporter produces invalid code for item
titles containing footnotes.  I've attached a minimal (non)working example.

The resulting LaTeX code (also attached) uses \footnote inside \section and
\paragraph macros, producing compiler errors.  A little googling turns up
the following comp.text.tex usenet post
https://comp.text.tex.narkive.com/lkZWQYaS/using-footnotes-in-paragraph,
explaining that \footnote is fragile and cannot be used in those contexts
without \protect.  Manually adding \protect before \footnote in the
automatically-generated tex file appears to produce correct results.

I don't know if the best fix is to always \protect \footnotes in LaTeX
export, or if more contextual smarts are required, but this seems like an
issue worth addressing.

Cheers!
Eric Anderson

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#+OPTIONS: toc:nil H:6
* a [fn:: note a]
** b
*** b
**** d [fn:: note b]

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% Created 2024-01-22 Mon 15:34
% Intended LaTeX compiler: pdflatex
\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{capt-of}
\usepackage{hyperref}
\usepackage{booktabs}
\usepackage{tabularx}
\author{Eric Anderson}
\date{\today}
\title{}
\hypersetup{
 pdfauthor={Eric Anderson},
 pdftitle={},
 pdfkeywords={},
 pdfsubject={},
 pdfcreator={Emacs 27.2 (Org mode 9.6.9)}, 
 pdflang={English}}
\usepackage[style=ieee]{biblatex}

\begin{document}

\section{a \footnote{note a}}
\label{sec:orgc7711ed}
\subsection{b}
\label{sec:orgc167c8a}
\subsubsection{b}
\label{sec:org14707a4}
\paragraph{d \footnote{note b}}
\label{sec:org6daeb07}
\end{document}