Issue with workflow while set process 'Create a job per group, grouping by operation'

Hello,

I'm facing this issue with fulfillment phase, where when I set the process to create a job per group, grouping by operation.

Fulfillment task in CR shows completed without any details. Screenshots below!

If I change the process setting on properties to any other value, It seems to works.

Aveksa Version : 6.9.1.P19

am I missing something here, or its a bug in the patch level.