% Public domain. From samcarter:
% https://tug.org/pipermail/tex-live/2025-February/051139.html
\documentclass{beamer}

\usepackage{tabularray}

\begin{document}

\begin{frame}
  \scriptsize
  \begin{longtblr}[]{}
    foo\TblrNote{*} & bar \\
  \end{longtblr}
\end{frame}

\end{document}

% In the following example, I get different font sizes for "foo" and "bar"
% if compiled with pdflatex from the 2025 pretest. Both words are
% displayed in the same size with lualatex/xelatex from TL2025 or
% pdflatex/lualatex/xelatex from TL2024.