pandoc-3.10: test/command/4690.md
```
% pandoc -t beamer
# title
:::: {.columns}
::: {.column width="8%"}
content
:::
::: {.column width="84%"}
content2
:::
::::
^D
\begin{frame}{title}
\protect\phantomsection\label{title}
\begin{columns}[T]
\begin{column}{0.08\linewidth}
content
\end{column}
\begin{column}{0.84\linewidth}
content2
\end{column}
\end{columns}
\end{frame}
```