latex ---> dvi ---> dvipdfmx ---> pdf
shows the same drawback:
\documentclass[dvipdfmx]{article}
\usepackage{lipsum}
\usepackage{tcolorbox}
%
\tcbuselibrary{breakable}
%
\begin{document}
%
\rule{0.4pt}{17cm}
%
\begin{tcolorbox}[breakable]
\lipsum[1]
\end{tcolorbox}
\lipsum
\end{document}
Therefore the bug may be in (x)dvipdfmx.
I have confirmed that, in the case of dvipdfmx,
\documentclass[dvipdfm]{article}
is ok, but
\documentclass[dvipdfmx]{article}
is ng.
Therefore the bug may be in dvipdfmx.def and xetex.def.
Best,
Akira
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