\documentclass{IEEEtran}
\usepackage{tabularray}
\begin{document}
\begin{table}
\begin{tblr}{colspec={c|c|c},hlines}
\hline
A & B & C \\
\SetCell[r=2]{c} A & B1 & C1 \\
& B2 & C2 \\
\hline
\end{tblr}
\end{table}
\end{document}
Is my misuse of tabularray causing this result?


\SetCell[r=2]{c}. If you add another table row with cells that span only one row you get the expected output. – leandriis Jan 04 '22 at 11:31\SetCell. It's a pity that there seems to be something wrong with\SetCellso far. – Clara Jan 04 '22 at 14:35