The decimal marker in bold number is not align with asymmetrical number format in table.

In the example in the 9.13 Tables with heading rows, the number is symmetrical, i.e., 3.3. But if we set a number like 3.6, the decimal marker are not aligned.

\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{siunitx}
\begin{document}
\robustify\bfseries
\begin{tabular}
{@{}S[text-series-to-math, table-format = 3.3]@{}}
\rowcolor[gray]{0.9}
\bfseries 123.456 \\
23.45
\\
123.4
\\
3.456 \\
\end{tabular}
\qquad
\begin{tabular}
{@{}S[text-series-to-math, table-format = 3.6]@{}}
\rowcolor[gray]{0.9}
\bfseries 123.456789 \\
23.45
\\
123.4
\\
3.456 \\
\end{tabular}
\qquad
\begin{tabular}
{@{}S[text-series-to-math, table-format = 3.6]@{}}
\rowcolor[gray]{0.9}
\bfseries 123.456 \\
23.45
\\
123.4
\\
3.456789 \\
\end{tabular}
\end{document}