pt-archiver gives error "Wide character in print at /usr/bin/pt-archiver line 6815" when using --bulk-insert while using character set alias

CREATE TABLE `t1` ( `col1` int(11) NOT NULL AUTO_INCREMENT, `col2` varchar(3) DEFAULT NULL, PRIMARY KEY (`col1`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4

insert into t1 (col2) values ('あ');
insert into t1 (col2) values ('あ');
insert into t1 (col2) values ('あ');
insert into t1 (col2) values ('あ'); 

mysql> select * from t1;
+------+------+
| col1 | col2 |
+------+------+
|    4 | あ   |
|    5 | あ   |
|    6 | あ   |
|    7 | あ   |
+------+------+ 

mysql> show create table test2.t1\G
*************************** 1. row ***************************
       Table: t1
Create Table: CREATE TABLE `t1` (
  `col1` int(11) NOT NULL AUTO_INCREMENT,
  `col2` varchar(3) DEFAULT NULL,
  PRIMARY KEY (`col1`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec) 

[root@yunus-shaikh-default ~]# pt-archiver --source u=root,p=*****,h=127.0.0.1:,P=3306,A=utf8mb4,D=test,t=t1 --dest D=test2 --skip-foreign-key-checks --bulk-insert --limit 100 --commit-each --no-delete --statistics --where "col1 = 5" --no-check-charset
Wide character in print at /usr/bin/pt-archiver line 6815. 

[root@yunus-shaikh-default ~]# pt-archiver --source u=root,p=*****,h=127.0.0.1,P=3306,D=test,t=t1,A=utf8mb4 --dest D=test2 --skip-foreign-key-checks --limit 100 --commit-each --no-delete --statistics --where "col1 = 5" 
Started at 2022-11-09T04:56:06, ended at 2022-11-09T04:56:06
Source: A=utf8mb4,D=test,P=3306,h=127.0.0.1,p=...,t=t1,u=root
Dest:   A=utf8mb4,D=test2,P=3306,h=127.0.0.1,p=...,t=t1,u=root
SELECT 1
INSERT 1
DELETE 0
Action         Count       Time        Pct
commit             4     0.0015      61.95
select             2     0.0004      16.65
inserting          1     0.0003      11.16
other              0     0.0002      10.25 

mysql> select * from test2.t1;
+------+------+
| col1 | col2 |
+------+------+
|    5 | あ   |
+------+------+