wp-admin still works after slug change

Hi,

I’ve changed the slug and 404 messages are displayed whenever someone tries to access wp-login, dashboard, wp-admin when they’re not logged in. However, I have a separate front-end login page for registered users, from whom I’ve hidden the admin bar using Hide Admin Bar From Non-admins. If they are logged in and type wp-admin they can still see the dashboard, access to which I thought should only be available through the new custom slug. Please let me know if this can be fixed as I don’t want them to be able to see it.

Thanks

https://wordpress.org/plugins/better-wp-security/