groups.memberships.list always returning null for membership type

[asharpe-sc]

TL;DR:
this is an issue specifically with the java client. calling cloudIdentity.groups().memberships().list(<insert group name>) returns a Membership[]. but the issue is that for each Membership in this array, the "type" field is always null. however, if i make a call to this API via the command line with gcloud this is not an issue.

Environment details

1. API: cloud identity java client, version: v1-rev20241208-2.0.0 (but even other versions produce this issue)
2. OS type and version: using MacOS sonoma
3. Java version:

~ % java -version
openjdk version "21.0.4" 2024-07-16 LTS
OpenJDK Runtime Environment Zulu21.36+17-CA (build 21.0.4+7-LTS)
OpenJDK 64-Bit Server VM Zulu21.36+17-CA (build 21.0.4+7-LTS, mixed mode, sharing)

Steps to reproduce

1. try to list the memberships of a group through the java client
2. print out the membership objects, and you will see that the "type" is always null

Code example

List<Membership> memberships = cloudIdentity.groups().memberships().list(<insert group name>).execute().getMemberships();
for (Membership membership : memberships) {
System.out.println(membership)
// you will see here that "type"is always null, instead of being populated with say "USER", "SERVICE ACCOUNT", "GROUP", etc.       
}

External references such as API reference guides

https://cloud.google.com/identity/docs/reference/rest/v1/groups.memberships/list

Additional info

note that if you try to call this API via the command line with gcloud, there are no issues - i see the "type" field being populated perfectly fine which makes me think this is an issue only with the java client.