Clash between environ and babel (french) packages

Question

The explicit code

\documentclass{standalone}
\usepackage[french]{babel}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\usetikzlibrary{babel}
\begin{document}
\begin{tikzpicture}
  \begin{semilogxaxis}[
    xmin=1e-1,
    xmax=1e4,
    ymin=0,
    ymax=1
  ]
    \draw[thick,blue,dashed] (axis cs:1,0) -- (axis cs:100,1);
  \end{semilogxaxis}
\end{tikzpicture}
\end{document}

works but if I use a new environment, it fails to compile

\documentclass{standalone}
\usepackage{pgfplots,environ}
\usepackage[french]{babel}
\usetikzlibrary{babel}
\pgfplotsset{compat=1.18}
\NewEnviron{MyEnv}[3][]{
  \begin{tikzpicture}
    \begin{semilogxaxis}[
      xmin={#2},
      xmax={#3},
      ymin=0,
      ymax=1
    ]
      \BODY
    \end{semilogxaxis}
  \end{tikzpicture}
}
\begin{document}
\begin{MyEnv}[]{1e-1}{1e4}
    \draw[thick,blue,dashed] (axis cs:1,0) -- (axis cs:100,1);
\end{MyEnv}
\end{document}

The second example compiles correctly if I comment out the babel package.

Any ideas on how to fix this? The shorthandoff suggestions in answers to other similar questions do not seem to work here.

Answer 1

---

EDIT: A better way to do this is to generate a list of current shorthands and then disable all of them, see this answer. Manually disabling shorthands like ; can lead to errors if ; is not a shorthand (see comments below).

---

Original answer: As suggested by @UlrikeFischer in the comments,

\AddToHook{env/MyEnv/begin}{\shorthandoff{;}}

to handle active characters works. The environ package was used to avoid conflicts with the tikz external library. The xparse package can also be used instead of environ.

\documentclass{standalone}
\usepackage[french]{babel}
\usepackage{xparse}
\usetikzlibrary{babel,external}
\tikzexternalize[prefix=figure]
\pgfplotsset{compat=1.18}
\AddToHook{env/MyEnv/begin}{\shorthandoff{;}}
\NewDocumentEnvironment{MyEnv}{O{}mm+b}{
    \begin{tikzpicture}
        \begin{semilogxaxis}[xmin={#2},xmax={#3},ymin=0,ymax=1]
            #4
        \end{semilogxaxis}
    \end{tikzpicture}
}{}
\begin{document}
    \begin{MyEnv}[]{1e-1}{1e4}
        \draw[thick,blue,dashed] (axis cs:1,0) -- (axis cs:100,1);
    \end{MyEnv}
\end{document}