s workaround please try with this merged into your conf.py
latex_elements = {
'preamble': r"""
\makeatletter
% we add a \normalsize to fix a ltjsbook + titlesec "\strutbox" problem
\titleformat{\subsubsection}{\normalsize\py@HeaderFamily}%
{\py@TitleColor\thesubsubsection}{0.5em}{\py@TitleColor}
% also extra \normalsize here
\titleformat{\paragraph}{\normalsize\py@HeaderFamily}%
{\py@TitleColor\theparagraph}{0.5em}{\py@TitleColor}
\titleformat{\subparagraph}{\normalsize\py@HeaderFamily}%
{\py@TitleColor\thesubparagraph}{0.5em}{\py@TitleColor}\makeatother
""",
}
I forgot in my message the \makeatother, but its absence should not harm in
fact.
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