varwidth not compatible with the new block code.

[u-fischer]

\DocumentMetadata{ testphase=block }
\documentclass{article}
\usepackage{varwidth}

\begin{document}
 Test:\fbox{\begin{varwidth}{5cm}
 \begin{enumerate}
 \item duck
 \item dinner
 \end{enumerate}
 \end{varwidth}}
 \end{document}

gives

without the block code it would look like this