Load data in system version with long unique does not work

CREATE TABLE t1 (data VARCHAR(4), unique(data) using hash) with system versioning;

INSERT INTO t1 VALUES ('A'),('B');

SELECT * INTO OUTFILE 'load.data' from t1;

select * from t1;

LOAD DATA INFILE 'load.data'  INTO TABLE t1;

select * from t1;

DROP TABLE t1;

--let $datadir= `select @@datadir`

--remove_file $datadir/test/load.data

CREATE TABLE t1 (data VARCHAR(4), unique(data) using hash) with system versioning;

INSERT INTO t1 VALUES ('A'),('B');

SELECT * INTO OUTFILE 'load.data' from t1;

select * from t1;

data

A

B

LOAD DATA INFILE 'load.data'  INTO TABLE t1;

select * from t1;

data

A

B

A

B

DROP TABLE t1;

main.abc                                 [ pass ]     12