Incompatibility between FnApiRunnerSplitTestWithMultiWorkers.test_checkpoint_sdf and beam_fn_api

```

test_checkpoint_sdf (apache_beam.runners.portability.fn_api_runner_test.FnApiRunnerSplitTestWithMultiWorkers)
... Traceback (most recent call last):
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py",
line 170, in _execute
response = task()
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py",
line 203, in
self._execute(lambda: worker.do_instruction(work), work)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py",
line 360, in do_instruction
request.instruction_id)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/sdk_worker.py",
line 386, in process_bundle
bundle_processor.process_bundle(instruction_id))
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/bundle_processor.py",
line 663, in process_bundle
data.transform_id].process_encoded(data.data)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/bundle_processor.py",
line 143, in process_encoded
self.output(decoded_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 256, in output
cython.cast(Receiver, self.receivers[output_index]).receive(windowed_value)

File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 143, in receive
self.consumer.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 594, in process
delayed_application = self.dofn_receiver.receive(o)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 776, in receive
self.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 782, in process
self._reraise_augmented(exn)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 780, in process
return self.do_fn_invoker.invoke_process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 588, in invoke_process
windowed_value, additional_args, additional_kwargs, output_processor)

File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 660, in _invoke_process_per_window
windowed_value, self.process_method(*args_for_process))

File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 919, in process_outputs
self.main_receivers.receive(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 143, in receive
self.consumer.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 594, in process
delayed_application = self.dofn_receiver.receive(o)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 776, in receive
self.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 782, in process
self._reraise_augmented(exn)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 780, in process
return self.do_fn_invoker.invoke_process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 441, in invoke_process
windowed_value, self.process_method(windowed_value.value))
File
"/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 919, in process_outputs
self.main_receivers.receive(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 143, in receive
self.consumer.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/worker/operations.py",
line 594, in process
delayed_application = self.dofn_receiver.receive(o)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 776, in receive
self.process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 782, in process
self._reraise_augmented(exn)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 849, in _reraise_augmented
raise_with_traceback(new_exn)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 780, in process
return self.do_fn_invoker.invoke_process(windowed_value)
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/runners/common.py",
line 441, in invoke_process
windowed_value, self.process_method(windowed_value.value))
File
"/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/transforms/core.py",
line 1358, in
wrapper = lambda x: [fn(x)]
File "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Phrase/src/sdks/python/test-suites/tox/py2/build/srcs/sdks/python/apache_beam/testing/util.py",
line 144, in _equal
'Failed assert: %r == %r' % (expected, actual))
BeamAssertException: Failed
assert: [(2, 0), (2, 1), (3, 0), (3, 1), (3, 2)] == [(3, 0), (3, 1), (3, 2), (3, 1), (2, 0), (2, 1),
(3, 0), (3, 2)] [while running 'assert_that/Match']

```

Imported from Jira [BEAM-8444](https://issues.apache.org/jira/browse/BEAM-8444). Original Jira may contain additional context.
Reported by: robertwb.