block code: items without actual list item body overlap

[u-fischer]

\DocumentMetadata{testphase={block}}
\documentclass{article} 
\begin{document}
\begin{description}
\item[blub]
\item[blub]
\item[blub]
\end{description} 
\end{document}

gives

Without the block code the output looks normal:

It happens also with other lists (itemize, enumerate) and also without optional argument. It works correctly from the first item with something in the body:

\DocumentMetadata{testphase={block}}
\documentclass{article} 
\begin{document}
\begin{enumerate}
\item 
\item 
\item x
\item 
\item 
\end{enumerate} 
\end{document}