mysqldump --innodb-optimize-keys breaks with foreign keys

With expand_fast_index_creation it fails to restore. It errors "Cannot add foreign key constraint".

mysql> show global variables like '%version%';
+-------------------------+-----------------------------------------------------------------+
| Variable_name | Value |
+-------------------------+-----------------------------------------------------------------+
| innodb_version | 5.6.16-rel64.1 |
| protocol_version | 10 |
| slave_type_conversions | |
| version | 5.6.16-64.1-rel64.1 |
| version_comment | Percona Server with XtraDB (GPL), Release rel64.1, Revision 563 |
| version_compile_machine | x86_64 |
| version_compile_os | Linux |
+-------------------------+-----------------------------------------------------------------+

mysql> show create table tbl1\G
*************************** 1. row ***************************
       Table: tbl1
Create Table: CREATE TABLE `tbl1` (
  `id_primary` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `a` int(11) unsigned DEFAULT NULL,
  `b` int(11) unsigned DEFAULT NULL,
  PRIMARY KEY (`id_primary`),
  UNIQUE KEY `a_b_tbl2_unique` (`b`,`a`),
  KEY `a` (`a`),
  CONSTRAINT `tbl1_ibfk_1` FOREIGN KEY (`a`) REFERENCES `tbl2` (`a`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `tbl1_ibfk_2` FOREIGN KEY (`b`) REFERENCES `tbl3` (`b`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

mysql [localhost] {msandbox} (test) > show create table tbl2\G
*************************** 1. row ***************************
       Table: tbl2
Create Table: CREATE TABLE `tbl2` (
  `id_primary` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `a` int(11) unsigned NOT NULL,
  `id_address` int(11) unsigned NOT NULL,
  `old_a` varchar(40) DEFAULT NULL,
  PRIMARY KEY (`id_primary`),
  UNIQUE KEY `a_unique` (`a`),
  KEY `id_address` (`id_address`),
  KEY `a` (`a`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

mysql [localhost] {msandbox} (test) > show create table tbl3\G
*************************** 1. row ***************************
       Table: tbl3
Create Table: CREATE TABLE `tbl3` (
  `id_primary` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) unsigned DEFAULT NULL,
  `id_transaction` int(11) DEFAULT NULL,
  `id_address` int(11) unsigned NOT NULL,
  `id_service` varchar(40) NOT NULL DEFAULT '',
  `old_b` varchar(40) DEFAULT NULL,
  `is_manship` tinyint(1) DEFAULT '0',
  PRIMARY KEY (`id_primary`),
  UNIQUE KEY `b_unique` (`b`),
  KEY `id_service` (`id_service`),
  KEY `id_address` (`id_address`),
  KEY `id_transaction` (`id_transaction`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

$ /root/download/ps5.6.16/bin/mysqldump -umsandbox -pmsandbox -S /tmp/mysql_sandbox5616.sock --innodb-optimize-keys test > test56.sql

$ [root@centos63 msb_ps5_6_16]# ./use test < test56.sql
ERROR 1215 (HY000) at line 53: Cannot add foreign key constraint

This differs with bug#1092189 as in this test case it contains unique keys also on tables.