13MaxG opened a new pull request, #34484:
URL: https://github.com/apache/beam/pull/34484

   Proposing a solution to https://github.com/apache/beam/issues/26190 . 
   It appears the Flatten was not setting a watermark, which caused following 
steps not to execute.  
   
   The issue was returning errors on beam versions 2.39 onwards, and it  
potentially produced unstable results before 2.39.  
   
   There are meaningful TODOs mentioned: 
   `# TODO(robertwb): Possibly fuse multi-input flattens into one of the 
stages.`
   `# TODO(pabloem): Consider case where there are various producers`
   
   It makes parts of the code redundant, a refactoring could be considered. 
   For now, I would like to test if this change evaluate correctly. 
   


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