consumer_test.py’s test_valid_assignment fails with new consumer

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/dist-packages/ducktape/tests/runner_client.py", line 186, in _do_run
    data = self.run_test()
  File "/usr/local/lib/python3.9/dist-packages/ducktape/tests/runner_client.py", line 246, in run_test
    return self.test_context.function(self.test)
  File "/usr/local/lib/python3.9/dist-packages/ducktape/mark/_mark.py", line 433, in wrapper
    return functools.partial(f, *args, **kwargs)(*w_args, **w_kwargs)
  File "/opt/kafka-dev/tests/kafkatest/tests/client/consumer_test.py", line 584, in test_valid_assignment
    wait_until(lambda: self.valid_assignment(self.TOPIC, self.NUM_PARTITIONS, consumer.current_assignment()),
  File "/usr/local/lib/python3.9/dist-packages/ducktape/utils/util.py", line 58, in wait_until
    raise TimeoutError(err_msg() if callable(err_msg) else err_msg) from last_exception
ducktape.errors.TimeoutError: expected valid assignments of 6 partitions when num_started 2: [('ducker@ducker05', []), ('ducker@ducker06', [])]

failures: 
  - 'kafkatest/tests/client/consumer_test.py::AssignmentValidationTest.test_valid_assignment@{"metadata_quorum":"ISOLATED_KRAFT","use_new_coordinator":true,"group_protocol":"consumer","group_remote_assignor":"range"}'