I moved this to our Salesforce Canvas Adapter section of the Community where hopefully someone has an answer. If no one does, I would suggest contacting Support@tableau.com
Also, If you find an answer, please post it here:
You might be able to help other users as well :-)
@ Sid Surana,
We are in touch with support team, issue is not yet solved.
Hey - try refreshing after you publish in the Tableau Server. Just hit the :Refresh data for this view" button. I had a similar issue for a few months and happily found this solution. You can then download the workbook and it will have all of the fully refreshed data in it. Hope this helps!