Filtering in "Recent Posts" not working

When not logged in to my page,
opening the Blogpage in the “Recent Posts” widget only the “public” posts are visible – so far correct.

But selecting another non-blog page, the Widget shows also the “hidden” posts.

Is this a bug or can this be prevented ?

Regards
Geisibee

http://ww.wp.xz.cn/extend/plugins/wordpress-access-control/