Is it possible to have a frame with continuation title and have a different subtitle per each frame break? Following the MWE:
\documentclass{beamer}
\setbeamertemplate{frametitle continuation}[from second]
\begin{document}
\begin{frame}[allowframebreaks]{Title}
\framesubtitle{Subtitle 1}
test 1
\framebreak
\framesubtitle{Subtitle 2}
test 2
\end{frame}
\end{document}
The problem is that beamer takes 'Subtitle 2' for all slides.