TheNeuralBit commented on issue #22854:
URL: https://github.com/apache/beam/issues/22854#issuecomment-1252802450

   It looks like this also affects Sequences of Rows, like the following 
structure:
   
   ```
   class Bar(NamedTuple):
     field: int
   
   class Foo(NamedTuple):
     sequence: Sequence[Bar]
   ```
   
   This is used in xlang KafkaIO, when `with_metadata=True` is specified. So 
Python's KafkaIO with with_metadata=True will fail at pipeline construction 
time in Beam 2.41.0 (FYI @johnjcasey).
     


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