[CMT8.4.1.1209]When there are two tables which names are same, it will pop fk cannot found

1 There are two tables.
CREATE TABLE `A` (
`i` int(11) DEFAULT NULL,
`d` int(11) DEFAULT NULL,
`a` int(11) DEFAULT '0',
KEY `A_ab` (`i`),
CONSTRAINT `A_ab` FOREIGN KEY (`i`) REFERENCES `ab` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

CREATE TABLE `a` (
`a` int(11) NOT NULL DEFAULT '0',
`b` int(11) DEFAULT NULL,
`c` int(11) DEFAULT NULL,
`d` int(11) DEFAULT '0',
PRIMARY KEY (`a`),
KEY `a_b_id` (`b`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

CREATE TABLE `ab` (
`b` decimal(63,0) DEFAULT NULL,
`a` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`a`),
KEY `b_idx` (`b`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='aaaass'
2 Do migration from online to online.
3 Goto step3, only choose A and a
4 Click next, it will pop the error as attachement.

If click the fk in A, needn't change anything, it can be ok.