I think we also need to fix the code that is tested by this test. It looks like we are using a pipeline option https://github.com/apache/beam/blob/c7d134a35dca488f0cbdf607013a6027599b96ca/sdks/python/apache_beam/options/pipeline_options.py#L671 to pass a pickled piece of code that performs some validation logic in test pipelines. In Python 3 these pickled objects will be returned as bytes, which we will attempt to concat to a string: https://github.com/apache/beam/blob/c7d134a35dca488f0cbdf607013a6027599b96ca/sdks/python/apache_beam/testing/test_pipeline.py#L155 This test is running into the same problem.
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