Line break command ignored within frame in beamerarticle

[ysalmon]

I have a tblr with a multiline cell, but the \\ line breaking command seems ignored when in a frame environment in a beamerarticle :

\documentclass{article}
\usepackage{beamerarticle}
\usepackage{tabularray}

\begin{document}
\begin{frame}
\begin{tblr}{hlines, vlines,
             columns={halign=c, valign=m, font=\scriptsize, colsep=4pt},
             column{1}={wd=4em}}
{$L_1.L_2$ \\ \tiny non vides}  \\
\end{tblr}
\end{frame}
\end{document}

gives

If I remove the frame environment, I correctly get

Of course the frame is there because my real example is from a larger presentation of which I am doing the article counterpart. Adding [fragile] does not help.

In the beamer version of the document, the line break is where I want it, but that may be by chance (it seems the line break happens "naturally" where LaTeX wants to put it, and not where I request it).