mongo 7.0 compatibility issue with arbiter

[figachek]

Hello.
Environment:
pymongo 4.8.0
mongod 7.0.14

when we try to check remote mongo arbiter host:
./check_mongodb.py -A memory -W 1 -C 1 -P 27017 -H arbiter_host -u user -p password

in result = con.admin.command("ismaster") we have:

The value of result is: {'topologyVersion': {'processId': ObjectId('66cf62f2b99c7dc571401122'), 'counter': 7}, 'hosts': ['slave_host:27017', 'master_host:27017'], 'arbiters': ['arbiter_host:27017'], 'setName': 'rs0', 'setVersion': 31, 'isWritablePrimary': True, 'secondary': False, 'primary': 'master_host:27017', 'me': 'master_host:27017', 'electionId': ObjectId('7fffffff000000000000005e'), 'lastWrite': {'opTime': {'ts': Timestamp(1726669197, 1), 't': 94}, 'lastWriteDate': datetime.datetime(2024, 9, 18, 14, 19, 57), 'majorityOpTime': {'ts': Timestamp(1726669197, 1), 't': 94}, 'majorityWriteDate': datetime.datetime(2024, 9, 18, 14, 19, 57)}, 'maxBsonObjectSize': 16777216, 'maxMessageSizeBytes': 48000000, 'maxWriteBatchSize': 100000, 'localTime': datetime.datetime(2024, 9, 18, 14, 20, 0, 658000), 'logicalSessionTimeoutMinutes': 30, 'connectionId': 4272759, 'minWireVersion': 0, 'maxWireVersion': 21, 'readOnly': False, 'ok': 1.0, '$clusterTime': {'clusterTime': Timestamp(1726669197, 1), 'signature': {'hash': b'\xf5h\x93O\xeb2Ee\x8d9\x16\xd9Q\x99\xc9-Xo\xec>', 'keyId': 7376314462082433025}}, 'operationTime': Timestamp(1726669197, 1)}

expected to receive: 'arbiterOnly': True, but nothing

ismaster is depricated since 4.4.2 https://www.mongodb.com/docs/v4.4/reference/command/isMaster/
but using the result = con.admin.command("hello") https://www.mongodb.com/docs/manual/reference/command/hello/
give us the same result.

We can't determine arbiter host

Please help to check arbiter
Thanks