test_merge_update_match_set fails:MERGE INTO bucket b1 USING bucket b2 not working in a particular case

Test this scenario:

1. create 2 empty buckets default and standard_bucket.
2. INSERT into standard_bucket0 (key , value) VALUES ("test",

);
3. INSERT into default (key , value) VALUES ("new1",

);
4. MERGE INTO default b1 USING standard_bucket0 b2 on key name when matched then update set b1.name="edit";
5. SELECT name FROM default
should return the updated value "edit"

It does return "edit", in 2151.