I have space viewable to anonymous users with few pages restricted view only to some group. I have

{children}

mark on space home page and it correctly hides restricted pages if home page is accessed by anonymous user. If I create another page containing

{index} viewable to anonymous users, they can acctually read start of those restricted pages there. Now I can also restrict this index page, which "solves" the problem. I didn't try another scenario, but I think that if anonymous users have right to even add pages, they can create such {index}

page with no possibility to prevent them to read parts of "secret" pages again.

I think that proper behavior is to omit restricted pages in index if I don't have the rights to view them.