# How to center numbers in a table column with the siunitx package?

I've been trying and searching for quite some time, but I don't see what I'm doing wrong:

I want to create several table columns with decimal numbers (some in the format "1,25" and some like "3,156" or "12,247").

I tried:
(The vertical lines are only for seeing clearly where the columns begin and end.)

\documentclass[11pt, a4paper]{scrreprt}

\usepackage{booktabs}

\usepackage[round-mode=places, round-integer-to-decimal, round-precision=2,
table-number-alignment=center,
round-integer-to-decimal
]{siunitx}

\begin{document}

\footnotesize

\begin{tabular}{|S| S[round-precision=4]| c }
\multicolumn{1}{c}{$A_{max}$} & \multicolumn{1}{c}{$A_{max}$} & test \\
1,2345 & 1,2345 & 1,2345\\
1,23 & 1,23 & 1,23\\
1 & 1 & 1\\
1,23456 & 1,243456 & 1,23456\\
%11,23456 & 11,23456\\

\end{tabular}

\end{document}

I'd like the whole "number block" to be centered in the width of the column, however, in the result the decimal point seems to be the centered in the S-columns:

From my understanding of the siunitx-manual, the option table-number-alignment=center should do exactly that, shouldn't it?

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