candidate_count parameter not working for gemini-3-pro-preview

I’m getting this error when trying to request multiple candidates::

ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': 'Multiple candidates is not enabled for this model', 'status': 'INVALID_ARGUMENT'}}

Environment details:
- Programming language: Python
- Package version: 1.51.0

Code snippet:
client.models.generate_content(
model='gemini-3-pro-preview',
contents='What is the capital of the moon?',
config={
"candidate_count": 2
},
)

Is this working as intended? And is support for multiple candidates planned for this model?