Issue with reference to fermat equation in `example.md`

[cthoyt]

There appears to be a bug in the way that equations are labeled in the example paper in the following section:

inara/example/paper.md

Lines 432 to 447 in 92554be

	## Equations
	Cross-references to equations work similar to those for floating
	elements. The difference is that, since captions are not supported
	for equations, the label must be included in the equation:
	$$a^n + b^n = c^n \label{fermat}$$
	Referencing, however, is identical, with `\autoref{eq:fermat}`
	resulting in "\autoref{eq:fermat}".
	$$a^n + b^n = c^n \label{eq:fermat}$$
	Authors who do not wish to include the label directly in the formula can use a Markdown span to add the label:
	[$$a^n + b^n = c^n$$]{label="eq:fermat"}

The latest 1.1.5 build of Inara produces the following latex in https://github.com/openjournals/inara/actions/runs/12199377342/job/34033120544:

\subsection{Equations}\label{equations}

Cross-references to equations work similar to those for floating
elements. The difference is that, since captions are not supported for
equations, the label must be included in the equation:

\begin{verbatim}
$$a^n + b^n = c^n \label{fermat}$$
\end{verbatim}

Referencing, however, is identical, with
\texttt{\textbackslash{}autoref\{eq:fermat\}} resulting in
``\autoref{eq:fermat}''.

\[a^n + b^n = c^n \label{eq:fermat}\]

Authors who do not wish to include the label directly in the formula can
use a Markdown span to add the label:

\begin{verbatim}
[$$a^n + b^n = c^n$$]{label="eq:fermat"}
\end{verbatim}

Despite this, it still builds the draft and production PDFs. The draft PDF is downloadable from https://github.com/openjournals/inara/actions/runs/12199377342 as it renders like the following (red underline is from me)

How to get a solution

I think the problem is in the \label{eq:fermat} in the actual equation. Should it be a different command, like \ref{}?