Command \c@blx@sectionciteorder@1 already defined.

[dbitouze]

The following MCE:

\documentclass{article}
%
\usepackage{biblatex}
\addbibresource{biblatex-examples.bib}
%
\begin{document}
\tableofcontents
\newrefsection%
\section{About \citeauthor{knuth:ct:a}}
\printbibliography
\end{document}

used to work nicely with:

• biblatex 2020/12/31 v3.16,
• biber 2.16,

but that's not the case with:

• biblatex 2022/01/16 v3.17,
• biber 2.17 (beta),

the error message being:

! LaTeX Error: Command \c@blx@sectionciteorder@1 already defined.
               Or name \end... illegal, see p.192 of the manual.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.11 \section
             {About \citeauthor{knuth:ct:a}}
?

[dbitouze]

Sorry, wrong repo...