swth breaks `table-number-alignment` of siunitx

[LinqLover]

MWE:

\documentclass{swathesis}
%\documentclass{scrbook}

\usepackage{tabularray}
\UseTblrLibrary{siunitx}

\begin{document}

\begin{table}
\begin{tblr}{
    |
    X[si={table-alignment-mode=format,table-number-alignment=right}]
    |
    X[si={table-alignment-mode=format,table-number-alignment=center}]
    |
    X[si={table-alignment-mode=format,table-number-alignment=left}]
    |
}
    1.1 & 2.2 & 3.3 \\
\end{tblr}
\caption{Foo}
\end{table}

\end{document}

The alignment options are ignored.

If I use scrbook instead, it works:

Any idea why this happens or how I can solve this?