我找到了解决这个问题的办法。这不是一个“修复”，而是一种解决需要同步用户角色问题的方法。我没有尝试让所有用户角色匹配，而是决定只检查主站点的用户角色。请参见下面的我的函数，了解我是如何做到这一点的：

/*
* Function to check a specified user from a subsite against
* the role of that same user on the main site
*
* @param int $site_to_check the id of the site to check the user\'s role from
* @param int $user_id the user\'s id to check
*/
function cgc_check_for_citizen($site_to_check = 1, $user_id = null) {
    if(!isset($user_id)) {
        return false;
    }
    $citizen = false;

    global $blog_id;

    if($blog_id == 1) { // we\'re on the main site
        if(user_can($user_id, \'read_citizen\')) {
            $citizen = true;
        }
    } else {
        switch_to_blog($site_to_check);
            if(user_can($user_id, \'read_citizen\')) {
                $citizen = true;
            }
        restore_current_blog();
    }
    return $citizen;
}