\RequirePackage[2020-10-01]{latexrelease}
\input regression-test.tex
\documentclass{article}
\usepackage{kanban-board}
\begin{document}
\sbox0{\scriptsize $x$}% Load math font sizes outside captured output.
\START
\begin{kanban}
  \kanbantask[prio=high,author=Alice,due=31.12.2099]
    {Backlog}{Exercise the declared minimum LaTeX format}
  \kanbantask[completed]{Done}{Complete the compatibility probe}
\end{kanban}
\TYPE{KANBAN LATEX 2020 COMPATIBILITY OK}
\END
\end{document}