kennknowles commented on PR #28272:
URL: https://github.com/apache/beam/pull/28272#issuecomment-1715736420

   Actually each GBK has its own sequence of trigger firings, and when it comes 
to reshuffle there are two possibilities:
   
   1. The reshuffle does a GBK then explodes it (per its expansion) in which 
case the sequence of pane indices come from the Reshuffle/always trigger on 
that GBK.
   2. The reshuffle is a semantics "no op" at the PCollection level, in which 
case the pane indices would be preserved from an upstream aggregation, but 
reshuffle results in bundles from random upstream keys so they are deceptive.


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