[n1ql rbac] The builtin user is getting updated when specifying a new role on a different bucket

1. create a built in user on bucket-1 with role as data_reader:
curl -X PUT http://localhost:8091/settings/rbac/users/builtin/intuser -d "name=TestInternalUser2&roles=data_reader[Bucket-2]&password=pwintuser" -u Administrator:password

The user gets created.
2. create a new user on bucket-2 with role as data_reader_writer:
curl -X PUT http://localhost:8091/settings/rbac/users/builtin/intuser -d "name=TestInternalUser4&roles=data_reader_writer[Bucket-1]&password=pwintuser123" -u Administrator:password

Now in UI we see that TestInternalUser2 gets updated to TestInternalUser4.
Shouldnt we see both TestInternalUser2 and TestInternalUser4?