以下代码pdflatex在版本中运行时运行良好pdfTeX 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian)，但在版本中失败pdfTeX 3.14159265-2.6-1.40.21 (TeX Live 2020/Debian)：
\documentclass[english, paper=a4, fontsize=10pt, DIN]{scrartcl}
\usepackage{seqsplit}
\usepackage{ulem}
\begin{document}
\sout{\seqsplit{Sometext}}
\end{document}
事情是这样的：
pdflatex minimap.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/Debian) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./minimal.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-01-09> xparse <2020-03-03>
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrartcl.cls
Document Class: scrartcl 2020/09/21 v3.32 KOMA-Script document class (article)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrkbase.sty
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrbase.sty
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlfile.sty
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlfile-hook.sty
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlogo.sty)))
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty)))
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/tocbasic.sty)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrsize10pt.clo)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/typearea.sty))
(/usr/share/texlive/texmf-dist/tex/latex/seqsplit/seqsplit.sty)
(/usr/share/texlive/texmf-dist/tex/generic/ulem/ulem.sty)
(/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
LaTeX Warning: Unused global option(s):
[english,DIN].
(./minimal.aux)
! Extra }, or forgotten \endgroup.
\UL@stop ...z@ \else \UL@putbox \fi \else \egroup
\egroup \UL@putbox \fi \if...
l.7 \sout{\seqsplit{Sometext}}
?
知道如何修复它吗？
但总体目标是，如果空间不够，长文本就会换行，并且该文本会被删除。