Able to browse to /login while already logged in

[edtownend]

It appears that it is possible to view the login page when already logged in. I'm using the default /login slug, I've disabled all other plugins and rebuilt the permalinks and the problem seems to persist.

As a result of this, if you get the password wrong at the first attempt, then log in correctly, I was redirected back to the login page so it looked like I still wasn't logged in, but I was in fact.

[edtownend]

As a temporary workaround I wrote the below.

function dm2_fix_login_issue(){
    if (
        in_array( $GLOBALS['pagenow'], array( 'wp-login.php', 'wp-register.php' ))
        && ! (isset($_REQUEST['action']) || $_REQUEST['action'] == 'logout')
        && is_user_logged_in()
    ) {
        wp_redirect( home_url() );
        exit;
    }
}

add_action('init', 'dm2_fix_login_issue');