llncs: `\and` ignored after `\maketitle`

[nschloe]

trafficstars

MWE:

\documentclass{llncs}

\begin{document}
\keywords{Lorem \and ipsum}

\maketitle

\keywords{Lorem \and ipsum}
\end{document}

LaTeXML output:

  <keywords name="Keywords">Lorem  and ipsum</keywords>
  <keywords name="Keywords">Lorem ipsum</keywords>