I use simplebnf package to render bnf syntax. But it returns LaTeX Error: Environment bnf undefined.
Initially I thought it is another XeLaTaX compatibility issue, but when I used xelatexmk it successfully render the correct document.

Here is the tex file I used

\documentclass[11pt,a4paper]{article}
\usepackage{simplebnf}

\begin{document}
\begin{center}
    \begin{bnf}
        $e$ : Expr ::=
        | \texttt{num}
        | $e + e$
        | $e - e$
        | $e \times e$
        | $e \div e$
    \end{bnf}
\end{center}
\end{document}

and the tectonic version I am using is 0.15.0

Does anyone have a clue?