DDL to add FK on one node fails but completes on other nodes causing inconsistency

+------+---------+----------------------+
| NAME | STATE | IPV4 |
+------+---------+----------------------+
| pxc1 | RUNNING | 10.84.148.120 (eth0) |
+------+---------+----------------------+
| pxc2 | RUNNING | 10.84.148.214 (eth0) |
+------+---------+----------------------+
| pxc3 | RUNNING | 10.84.148.240 (eth0) |
+------+---------+----------------------+

#!/bin/bash
MYSQLROOTCMD='mysql -uroot -psecret'
MYSQLTESTCMD='mysql -umytest -pmytest'
NODE1=10.84.148.120
NODE2=10.84.148.214
$MYSQLROOTCMD -h$NODE1 -e "drop user 'mytest'@'10.%'";
$MYSQLROOTCMD -h$NODE1 -e "drop database mytest1";
$MYSQLROOTCMD -h$NODE1 -e "select @@hostname, user()";
$MYSQLROOTCMD -h$NODE1 -e "create database mytest1";
$MYSQLROOTCMD -h$NODE1 -e "create user 'mytest'@'10.%' identified by 'mytest'";
$MYSQLROOTCMD -h$NODE1 -e "grant all privileges on mytest1.* to 'mytest'@'10.%'";
$MYSQLROOTCMD -h$NODE1 -e "create table mytest1.t1 ( id int primary key auto_increment, s int, m int, v varchar(100), key s_idx(s), key m_idx(m) ) engine=innodb";
$MYSQLTESTCMD -h$NODE1 -v -e "select @@hostname,user(); set foreign_key_checks=0; alter table mytest1.t1 add foreign key (m) references mytest2.t1 (id);";
$MYSQLROOTCMD -h$NODE1 -e "select @@hostname; show create table mytest1.t1\G"
$MYSQLROOTCMD -h$NODE2 -e "select @@hostname; show create table mytest1.t1\G"

+ mysql -uroot -psecret -h10.84.148.120 -e 'select @@hostname; show create table mytest1.t1\G'
mysql: [Warning] Using a password on the command line interface can be insecure.
+------------+
| @@hostname |
+------------+
| pxc1 |
+------------+
*************************** 1. row ***************************
 Table: t1
Create Table: CREATE TABLE `t1` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `s` int(11) DEFAULT NULL,
 `m` int(11) DEFAULT NULL,
 `v` varchar(100) DEFAULT NULL,
 PRIMARY KEY (`id`),
 KEY `s_idx` (`s`),
 KEY `m_idx` (`m`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
+ mysql -uroot -psecret -h10.84.148.214 -e 'select @@hostname; show create table mytest1.t1\G'
mysql: [Warning] Using a password on the command line interface can be insecure.
+------------+
| @@hostname |
+------------+
| pxc2 |
+------------+
*************************** 1. row ***************************
 Table: t1
Create Table: CREATE TABLE `t1` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `s` int(11) DEFAULT NULL,
 `m` int(11) DEFAULT NULL,
 `v` varchar(100) DEFAULT NULL,
 PRIMARY KEY (`id`),
 KEY `s_idx` (`s`),
 KEY `m_idx` (`m`),
 CONSTRAINT `t1_ibfk_1` FOREIGN KEY (`m`) REFERENCES `mytest2`.`t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin

| pxc2-bin.000003 | 14649 | Query | 1 | 14791 | alter table mytest1.t1 add foreign key (m) references mytest2.t1 (id)

--------------
alter table mytest1.t1 add foreign key (m) references mytest2.t1 (id)
--------------
ERROR 1142 (42000) at line 1: REFERENCES command denied to user 'mytest'@'pxc3.lxd' for table 'mytest2.t1'