egalpin commented on issue #21690:
URL: https://github.com/apache/beam/issues/21690#issuecomment-1156747294

   Just confirmed that @steveniemitz suggestion of using the WindowFn + 
Window.into rather than `setWindowingStrategyInternal` corrects the error 
described here.  I must admit I don't fully grasp _why_ yet (following up on 
@steveniemitz's comment RE `setWindowingStrategyInternal` not creating a new 
PCollection for my own understanding).
   
   Opened a PR at https://github.com/apache/beam/pull/21895 as an alternative 
to reverting.


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