hjtran commented on issue #36480:
URL: https://github.com/apache/beam/issues/36480#issuecomment-3391899379

   I did a little print debugging and it looks like we advance the watermark to 
inf for the `_GroupByKeyOnly` transform before we actually start processing any 
elements. The directrunner is a bit complex so I got lost from there trying to 
figure out where this might be happening


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