I’ve gone over the documentation on how to create a custom latex template for nbconvert, and I found a few good ones to work from, most notably Julius Schulz post here. Everything seemed to be working a couple of weeks ago, using the  markdown syntax and a template similar to the one from his website, but now all of the figures are simply using the same default behavior, presumably from Pandoc. No matter what I put in the ((*- block data_png -*)) section, it makes no impact on the converted latex - every PNG always uses the formatting here:
\begin{figure}
\centering
\includegraphics{path.png}
\caption{caption}
\end{figure}
Assuming I’m the only one having this issue, can anyone help me understand what could be going on? The only way I can get the \begin{figure} block to change is to override ((*- block markdowncell -*)) or an input group higher up, but I would have thought something like
((*- block data_png -*))
<My LaTeX code>
((* endblock *))
would override Pandoc’s behavior for any PNG image and allow me to use my code instead.
Thank you!