bug-252a.sil

\begin[papersize=a7,class=book]{document}
\use[module=packages.retrograde,target=v0.15.0]
\use[module=packages.lorem]
\use[module=packages.rebox]
\footnote:separator{\skip[height=5pt]}
\define[command=deepbox]{\rebox[depth=60pt,height=10pt]{x}}
This is a test\footnote{\deepbox}.
\end{document}