[BP 6.0.3] getIndexStatus returns incorrect num_partition

Create Index:
create index idx3 on `travel-sample`(age) partition by HASH(meta().id) with

{"num_partition":8}

Output of getIndexStatus:
CREATE INDEX `idx3` ON `travel-sample`(`age`) PARTITION BY hash((meta().`id`)) WITH

{ "nodes":[ "10.100.172.48:9000","127.0.0.1:9001" ], "num_partition":4 }