egalpin commented on issue #21690:
URL: https://github.com/apache/beam/issues/21690#issuecomment-1156593434

   Thanks @steveniemitz , that very well could be the issue!  I definitely need 
some guidance.  I had seen in other places in the codebase that `Flatten` was 
used to explicitly force the creation of a new PCollection.  My original idea 
was to write a test so that I could play around with 
`setWindowingStrategyInternal` Vs. `Window.into` Vs. 
`Flatten`/`PCollection.createPrimitiveOutputInternal` but I wasn't able to 
reproduce this issue in testing.
   
   Any thoughts on alternative methods of reapplying the same windowing without 
using `setWindowingStrategyInternal`? 


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