Can't able to reproduce with PS 5.5

mysql> show create table test \G
*************************** 1. row ***************************
       Table: test
Create Table: CREATE TABLE `test` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(10) DEFAULT NULL,
  `city` varchar(10) DEFAULT NULL,
  `dept_id` int(11) DEFAULT NULL,
  `role` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `role_dept_id` (`role`,`dept_id`)
) ENGINE=InnoDB AUTO_INCREMENT=155 DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

mysql>  SELECT id, name, city FROM test WHERE dept_id = 3 AND role = 'manager' ORDER BY name, city;
+-----+-----------+-----------+
| id  | name      | city      |
+-----+-----------+-----------+
| 141 | neel      | pune      |
| 125 | neel      | pune      |
| 122 | neel      | pune      |
| 133 | neel      | pune      |
|  87 | neel      | pune      |
| 129 | neel      | pune      |
|  83 | neel      | pune      |
| 137 | neel      | pune      |
|  79 | neel      | pune      |
|  75 | neel      | pune      |
| 140 | nilnandan | ahmedabad |
| 132 | nilnandan | ahmedabad |
| 136 | nilnandan | ahmedabad |
| 128 | nilnandan | ahmedabad |
| 124 | nilnandan | ahmedabad |
| 121 | nilnandan | ahmedabad |
|  86 | nilnandan | ahmedabad |
|  82 | nilnandan | ahmedabad |
|  78 | nilnandan | ahmedabad |
|  74 | nilnandan | ahmedabad |
+-----+-----------+-----------+
20 rows in set (0.00 sec)

mysql> explain  SELECT id, name, city FROM test WHERE dept_id = 3 AND role = 'manager' ORDER BY name, city;
+----+-------------+-------+------+---------------+--------------+---------+-------------+------+-----------------------------+
| id | select_type | table | type | possible_keys | key          | key_len | ref         | rows | Extra                       |
+----+-------------+-------+------+---------------+--------------+---------+-------------+------+-----------------------------+
|  1 | SIMPLE      | test  | ref  | role_dept_id  | role_dept_id | 18      | const,const |   20 | Using where; Using filesort |
+----+-------------+-------+------+---------------+--------------+---------+-------------+------+-----------------------------+
1 row in set (0.01 sec)

mysql> SELECT id, name, city FROM test WHERE dept_id = 3 AND role = 'manager' ORDER BY name, city limit 0,8;
+-----+------+------+
| id  | name | city |
+-----+------+------+
| 141 | neel | pune |
| 125 | neel | pune |
| 122 | neel | pune |
| 133 | neel | pune |
|  87 | neel | pune |
| 129 | neel | pune |
|  83 | neel | pune |
| 137 | neel | pune |
+-----+------+------+
8 rows in set (0.00 sec)

mysql> SELECT id, name, city FROM test WHERE dept_id = 3 AND role = 'manager' ORDER BY name, city limit 8,8;
+-----+-----------+-----------+
| id  | name      | city      |
+-----+-----------+-----------+
|  79 | neel      | pune      |
|  75 | neel      | pune      |
| 140 | nilnandan | ahmedabad |
| 132 | nilnandan | ahmedabad |
| 136 | nilnandan | ahmedabad |
| 128 | nilnandan | ahmedabad |
| 124 | nilnandan | ahmedabad |
| 121 | nilnandan | ahmedabad |
+-----+-----------+-----------+
8 rows in set (0.00 sec)

mysql> SELECT id, name, city FROM test WHERE dept_id = 3 AND role = 'manager' ORDER BY name, city limit 16,8;
+----+-----------+-----------+
| id | name      | city      |
+----+-----------+-----------+
| 86 | nilnandan | ahmedabad |
| 82 | nilnandan | ahmedabad |
| 78 | nilnandan | ahmedabad |
| 74 | nilnandan | ahmedabad |
+----+-----------+-----------+
4 rows in set (0.00 sec)

mysql>