Dear Ulrike,
I can avoid the problem by redefining this two commands of a current
pgfsys-dvipdfmx.def:
Thanks. I find it is also ok with
\documentclass[]{article}
\usepackage{lipsum}
\usepackage{tcolorbox}
%
\tcbuselibrary{breakable}
\makeatletter
\def\pgfsys@dvipdfmx@suspendcontent{%
\special{pdf: bcontent}%
\special{pdf:code q -1 0 0 -1 0 0 cm q}%
\special{pdf: econtent}%
\special{pdf: bcontent}%
\special{pdf:code -1 0 0 -1 0 0 cm}%
\special{pdf:code q}% translate to original system
}
\def\pgfsys@dvipdfmx@unsuspendcontent{%
\special{pdf:code Q Q Q}%
\special{pdf: econtent}%
}
\makeatother
%
\begin{document}
%
\rule{0.4pt}{17cm}
%
\begin{tcolorbox}[breakable]
\lipsum[1]
\end{tcolorbox}%
\lipsum
\end{document}
though I don't understand them.
Best,
Akira
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