Seminar example fails on updated TL20

[Scott Kostyshak]

On Sat, Oct 24, 2020 at 01:08:15PM +0200, Kornel Benko wrote:
> Am Sat, 24 Oct 2020 01:20:32 -0400
> schrieb Scott Kostyshak <skostysh at lyx.org>:
> 
> > 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
> 
> Same here.

Thanks. Not sure where to report it since it looks like the 'seminar'
package hasn't been updated for a while so it's likely from an update to
a different package. I'll try to make an MWE and figure out which
package change caused the failure.

Scott
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