[CMT8.4.1.1203]When there are two table name is same and one has fk, the referenced table will be lost in step4

1 Create three tables:
CREATE TABLE `A` (
`i` int(11) DEFAULT NULL,
KEY `A_ab` (`i`),
CONSTRAINT `A_ab` FOREIGN KEY (`i`) REFERENCES `ab` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

CREATE TABLE `a` (
`a` int(11) DEFAULT NULL,
`b` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8

CREATE TABLE `ab` (
`b` decimal(63,0) DEFAULT NULL,
`a` int(11) DEFAULT NULL,
KEY `id_a` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='aaaass'

2 choose the three table, do offline migration to online db.
3 goto step3,change A to A1, goto step4,it will display "hasn't reference table". Pls see the attachment.