"Double registration of Extensions" error when importing both fabricpb_pb2 and dataflowpb_pb2 in python script

[thomas-am]

Python script:

from fabric.fabric import fabricpb_pb2
from dataflow.dataflow import dataflowpb_pb2

generates this error:

Traceback (most recent call last):
  File "model-trials\sandbox\validates_samples.py", line 3, in <module>
    from dataflow.dataflow import dataflowpb_pb2
  File "dataflow\dataflow\dataflowpb_pb2.py", line 1708, in <module>
    google_dot_protobuf_dot_descriptor__pb2.MessageOptions.RegisterExtension(msg_meta)
ValueError: Double registration of Extensions

Expected behavior
No error

Environment

• Python 3.8.7 (win)