shunping commented on PR #35109:
URL: https://github.com/apache/beam/pull/35109#issuecomment-2945055938

   > The go to in this instance is check what happens on Dataflow. I'm pretty 
sure we've implemented things correctly and fixed legitimate bugs in the Prism 
implementation, but it's also an overall uncommon case, since windows + 
OnWindowExpiry is how that's handled usually in Java pipelines IIRC.
   > 
   > I know the Python runner implementations are incomplete in many ways. Not 
sure where Flink is in this case, and Spark and Samza were further behind.
   
   Yes. I verified that the behavior of prism and dataflow is the same on these 
tests. The problem is related to FnApiRunner (which is the go-to runner if we 
specify DirectRunner in python). 
   
   Filed an issue: #35168


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