\footnote not working correctly

[sieversMartin]

I'm trying to typset my paper for the SEUH24 conference, using (the
latest, I hope) class lni. I'm using Overleaf and started with the
Overleaf project link found on https://gi.de/service/publikationen/lni

However, \footnote{(text)} does not work for me.  Latex advances the
counter correctly but the number does not appear as a superscript and
(as far as I can tell) a dot following the \footnote{(text)} is
swallowed or ignored.  (I.e., foo\footnote{test}. bar results in foo3
bar, with the 3 *not* as a superscript.  The text (here: test) appears
correctly at the bottom of the page.)

The \footnote seems to correctly handle the author's info, i.e., the
number appears in superscript size/position.

Maybe you can help. Let me know if you have questions and/or would need
more information.