Another work-around is given on tex.sx at
http://tex.stackexchange.com/a/300259/1913 (cu’n{pasted below)
You can cure the bug by adding
\usepackage{etoolbox}
\makeatletter
\patchcmd{\ttlh@hang}{\parindent\z@}{\parindent\z@\leavevmode}{}{}
\patchcmd{\ttlh@hang}{\noindent}{}{}{}
\makeatother
after \usepackage{titlesec}.
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https://bugs.launchpad.net/bugs/1574052
Title:
titlesec does not render section numbers
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