Extra gray space in the viewer when there are pages with different lengths

[cristiangodoy-aotc]

Expected behavior

There shouldn't be a gap between pages, even if there are pages with different lengths.

Actual behavior

If the document has pages of different lengths then the viewer places a gray space between pages, apparently so that the shorter pages take the same space as the longer ones.

How to reproduce

Compile the following code:

\documentclass[crop]{standalone}
\standaloneenv{page}
\begin{document}
	\begin{page}
		\begin{minipage}[][10cm]{5cm}
			Longer page.
		\end{minipage}
	\end{page}
	\begin{page}
		\begin{minipage}[][5cm]{5cm}
			Shorter page.
		\end{minipage}
	\end{page}
\end{document}

Also, as you can see with this code, environments defined through \standaloneenv are highlighted as mistakes by the editor.