`\exp_not:n` leaked to action when expanding `\expanded`

\documentclass{article}
\usepackage{unravel}
\unravel{\expanded{\relax}}

\begin{document}
\end{document}

||
|> \expanded {\relax }

[===== Step 1 =====] \expanded = \expanded
|| \expanded
|> {\relax }

[===== Step 2 =====] \expanded {\exp_not:n {\relax }}=\relax
||
|> \relax

[===== Step 3 =====] \relax = \relax
||
|>

[===== End =====]

blefloch / latex-unravel

`\exp_not:n` leaked to action when expanding `\expanded` #58