Comment 2 for bug 1333650

Thank you for the problem report. It's easy to confirm:

[openxs@centos ~]$ mysql -uroot test
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.17-66.0 Percona Server (GPL), Release 66.0, Revision 608

Copyright (c) 2009-2014 Percona LLC and/or its affiliates
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> set session binlog_format=mixed;
Query OK, 0 rows affected (0.00 sec)

mysql> PREPARE stmt1 FROM 'set statement binlog_format=row for SELECT @@binlog_format';
Query OK, 0 rows affected (0.00 sec)
Statement prepared

mysql> execute stmt1;
+-----------------+
| @@binlog_format |
+-----------------+
| ROW |
+-----------------+
1 row in set (0.00 sec)

mysql> execute stmt1;
+-----------------+
| @@binlog_format |
+-----------------+
| MIXED |
+-----------------+
1 row in set (0.00 sec)

mysql> deallocate prepare stmt1;
Query OK, 0 rows affected (0.00 sec)