stankiewicz commented on issue #34145:
URL: https://github.com/apache/beam/issues/34145#issuecomment-2694803194

   proto concat is similar in behaviour to mergeFrom - It may replace singular 
fields (here we are not replacing as unknown placeholder has only new fields), 
but for repeated fields it will  concatenates. 
   in problematic test unknown placeholder is created with empty singular 
fields but array has 2 elements - first element is empty row, while second 
contains new unknown field.
   
   When merged, repeated1 will contain 4 elements which is expected. 


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