`rack networks subnet list` returns `<nil>` for Network ID

[catalyst-joe-guo]

create a network:

rack networks network create --name my-network

create a subnet in above network:

rack networks subnet create --network-id <NETWORK-ID> --ip-version 4 --cidr 10.10.10.0/24 --name my-subnet

list subnet:

rack networks subnet list

shows for Network ID:

ID			  Name			Network ID	CIDR		EnableDHCP	GatewayIP
<SUBNET-ID>         my-subnet	        <nil>		10.10.10.0/24	false		

but it's actually not nil when using get:

  rack networks subnet get --id  <SUBNET-ID>