Seminar example fails on updated TL20

[Scott Kostyshak]

This document used to compile on an older system for me.

Now I get the following LaTeX error when compiling to PDF (pdflatex):

! Extra \endgroup.
\document ->\endgroup
                      \the \before at document \begingroup \UseOneTimeHook {beg...
l.63 \begin{document}

Can others reproduce?

Scott
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