pt-table-checksum fails to build replace query when table lack a primary key (uq is present) and text fields are involved

CREATE TABLE test2 (
  col1 int NOT NULL,
  col2 text NOT NULL,
  col3 varchar(5) NOT NULL,
  UNIQUE KEY (col1, col2(3))
);
insert into test2 values(1,'aaa','aaa'); 

update test2 set col3="bbb";

$ pt-table-sync --host=127.0.0.1 --port=21325 h=127.0.0.1,D=test,t=test2 --sync-to-master --print --user=a -pa --chunk-size=1 --hex-blob 
...
REPLACE INTO `test`.`test2`() VALUES () /*percona-toolkit src_db:test src_tbl:test2 src_dsn:D=test,P=21324,h=127.0.0.1,p=...,t=test2,u=a dst_db:test dst_tbl:test2 dst_dsn:D=test,P=21325,h=127.0.0.1,p=...,t=test2,u=a lock:1 transaction:1 changing_src:1 replicate:0 bidirectional:0 pid:26264 user:X host:Y.percona.com*/;