duplicate items were sent when delete edge | vertex .

[CBS]

duplicate items were sent when delete edge | vertex .
This is a graph bug, need to using dedup node . instead of PR : #1244

recreate step :

CREATE SPACE test_space (partition_num=1,replica_factor=1, vid_type=fixed_string(30)); \
USE test_space; \
create tag t1(c1 fixed_string(40)); \
create edge e1(c1 fixed_string(40)); \
create edge index ei1 on e1(c1);

insert vertex t1(c1) values "1":("row"), "2":("row"), "3":("row")
insert edge e1(c1) values "1" -> "2"@0:("row"), "2" -> "1"@0:("row")
delete vertex "1","2"

[shylock]

What's the issue, I execute the ngql and nothing happened.