Abacn commented on PR #28272:
URL: https://github.com/apache/beam/pull/28272#issuecomment-1725951616

   @kennknowles thanks for pin to the related code path for Dataflow legacy 
worker. I now understand that Dataflow legacy work does some special PTransform 
override for ReShuffle. For portable pipelines, is that true that there is no 
longer similar PTransform override, and a possible fix would change java core's 
ReShuffle to also recover pane (currently it recovers Timestamp) ?
   
https://github.com/apache/beam/blob/346541b1b824e0343a736ce4e320667b8d73ec06/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Reshuffle.java#L105
   


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