ocgx2 does not work with sumatra, but ocgx does

Question

According to this artivle Can I automatically split an ocg environment over page breaks a new pages was introduced by AlexG

\documentclass{article}
% \usepackage{ocgx2}[2015/11/23]
\usepackage{ocgx}
\begin{document}
\begin{ocg}{OCG 1}{ocg1}{0}
first example.
\end{ocg}
\begin{ocg}{OCG 2}{ocg2}{0}
second example.
\end{ocg}
\begin{ocg}{OCG 3}{ocg3}{0}
third example. 
\end{ocg}
\end{document}

Expecting empty page, also in Sumatra 2.5.2 If you use ocgx the page IS empty, im Sumatra also as in Acrobat. If you use ocgx2 the page is empty in Acrobat Reader only, but all conents will be displayed at sumatra reader. If you use current sumatra 3.1.1 no changes are seen.

to make it clear: I am not expecting to toggle any content in sumatra, but I am expecting that nothing will be displayed first, (as ocgx does).

Seems to me like a bug?