Raw use of \label for pgfplots

[dginev]

I arrived at a minimal example for a latexml Fatal (but perfectly healthy pdflatex), which I couldn't fix on a short notice, so I am recording it as a new issue.

Ideally we have enough correctly emulated in raw interpretation for the re-binding of \label to succeed here, rather than enter an infinite loop:

source was arXiv:2111.04705

\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\usepackage{tikz}

\begin{document}

\begin{figure}
  \begin{tikzpicture}
      \begin{groupplot}
    \nextgroupplot[title={$n=100$}]
    \addplot [domain=0:.5, color=blue] coordinates {
    (0,0.0760000000000001)
    (0.1,0.0800000000000001)
    (0.2,0.242)
    (0.3,0.41)
    (0.4,0.65)
    (0.5,0.860000000000001)
    };
    \label{plots:plot1} % errors + infinite loop here
    \end{groupplot}
  \end{tikzpicture}
\caption{C}
\label{fig:BivCompGausWilcox}
\end{figure}

\end{document}