Title of the posts in hidden category is viewable to public

Hello,

We have some categories that are viewable only to specific usergroups by setting its privacy to "Assigned Joomla User Group".

The problem is…
when viewing a post entry (which is viewable to public), the title of the posts in hidden category appears in next/previous post section. (screenshot attached.)

So when public users click on that tile, they will see the error message "400 You are not authorized to view this blog entry."


I hope users will not see the post titles anywhere if they don't have permission to view the posts.
Is it possible?

Thanks,
Rikao