NiceArray unknown issue

Question

I'm trying to compile the simplest MWE with NiceArray environment from nicematrix package

\documentclass{article}
\usepackage{nicematrix}

\begin{document}

\[
\begin{NiceArray}{ccc}
1 & 2 & 3
\end{NiceArray}
\]

\end{document}

The PDF compiles, but I'm receiving an unexpected error

! Package nicematrix Error: There is a problem. Maybe your environment
(nicematrix)                {NiceArray} is empty. Maybe you have used l, c
(nicematrix)                and r instead of L, C and R in the preamble of
(nicematrix)                your environment.
(nicematrix)                If you go on, the result may be incorrect.

Full log: here

Answer 1

Thanks to daleif for pointing me into the problem in comments.

Indeed, the manual of my old version of nicematrix's that I'm using, basically describes that