Hi Rahul,
Have you also run report RSWD_REPLICATE_FROM_9999 to re-generate the WF template WS50100024? My understanding is that you have an entry in SWI1?
As mentioned in OSS note 1041016, if Workflow is triggered, but the agent determination is correctly perfromed, it might be worth going to PFTC_CHG > Choose 'Standard task' and for 50100025,50100026,50100066,50100075: In the menu 'Additinal data ->Agent Assignment ->Maintain, Mark as 'General' Task
Please let us know how this goes.
Cheers
taro