\vskip should always(?) break the line

[xworld21]

This normally compiles to two lines

\documentclass{article}
\begin{document}
First line
\vskip0.01em
second line
\end{document}

but LaTeXML does not add a line break because of https://github.com/brucemiller/LaTeXML/blob/f82b733eade2c81f24567c349929f2a696cb66cb/lib/LaTeXML/Engine/TeX_Glue.pool.ltxml#L89-L98 Checking for > 10 is very intentional, obviously, but why is that?