Able to reproduce with PXC 5.6.20

mysql> select @@version,@@version_comment;
+--------------------+--------------------------------------------------------------+
| @@version          | @@version_comment                                            |
+--------------------+--------------------------------------------------------------+
| 5.6.20-68.0-56-log | Percona XtraDB Cluster (GPL), Release 25.7, wsrep_25.7.r4126 |
+--------------------+--------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> \! netstat -lpn|grep 11211
tcp        0      0 0.0.0.0:11211           0.0.0.0:*               LISTEN      13354/mysqld    
tcp6       0      0 :::11211                :::*                    LISTEN      13354/mysqld    
udp        0      0 0.0.0.0:11211           0.0.0.0:*                           13354/mysqld    
udp6       0      0 :::11211                :::*                                13354/mysqld    
mysql> 


mysql>  show variables like '%memc%';
+----------------------------------+------------------+
| Variable_name                    | Value            |
+----------------------------------+------------------+
| daemon_memcached_enable_binlog   | ON               |
| daemon_memcached_engine_lib_name | innodb_engine.so |
| daemon_memcached_engine_lib_path |                  |
| daemon_memcached_option          |                  |
| daemon_memcached_r_batch_size    | 1                |
| daemon_memcached_w_batch_size    | 1                |
+----------------------------------+------------------+
6 rows in set (0.00 sec)

mysql> select @@log_slave_updates;
+---------------------+
| @@log_slave_updates |
+---------------------+
|                   1 |
+---------------------+
1 row in set (0.00 sec)

mysql> quit
Bye
root@deb-pxc56-1:/var/lib/mysql# telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
set a12 10 0 9
123456789
STORED
set a11 10 0 9
123456789
STORED
get a11
VALUE a11 10 9
123456789
END
quit
Connection closed by foreign host.
root@deb-pxc56-1:/var/lib/mysql# 
root@deb-pxc56-1:/var/lib/mysql# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.6.20-68.0-56-log Percona XtraDB Cluster (GPL), Release 25.7, wsrep_25.7.r4126

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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> select * from test.demo_test;
+-----+--------------+------+------+------+
| c1  | c2           | c3   | c4   | c5   |
+-----+--------------+------+------+------+
| a11 | 123456789    |   10 |    2 |    0 |
| a12 | 123456789    |   10 |    1 |    0 |
| AA  | HELLO, HELLO |    8 |    0 |    0 |
+-----+--------------+------+------+------+
3 rows in set (0.00 sec)


On  node2, 

mysql> select * from test.demo_test;
+----+--------------+------+------+------+
| c1 | c2           | c3   | c4   | c5   |
+----+--------------+------+------+------+
| AA | HELLO, HELLO |    8 |    0 |    0 |
+----+--------------+------+------+------+
1 row in set (0.00 sec)

mysql>