je-ik commented on issue #25975:
URL: https://github.com/apache/beam/issues/25975#issuecomment-1764561560

   > Interestingly, Flink UI reports the same Records sent from this stage when 
I do both parallelism = 2 and = 3
   
   This might be a hint. On restore, watermarks are recomputed from scratch. It 
might be the case that watermarks are not reconstructed correctly in this case 
in `KinesisIO`.
   
   Can you either try if you see metric `droppedDueToLateness` or enable debug 
to see [this log][1]?
   
    [1]: 
https://github.com/apache/beam/blob/6b32a3fb7d97ec932bde8c0d8c8b812ed2e940da/runners/core-java/src/main/java/org/apache/beam/runners/core/LateDataDroppingDoFnRunner.java#L132
   
   


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