Created Unassigned: SharePoint Designer cannot see a the workflow 2013 option when AutoSPInstaller creates the site collection [21678]

When I create the site collection (root web) using AutoSPInstaller, for a reason unknown to me yet, SharePoint Designer 2013 does not recognize the fact that I have a workflow manager farm registered.

Only:
1) when I delete the site collection and recreate from the user interface, then SharePoint designer recognizes that I could create 2013 Workflows for that site collection as an option.
2) or switch to another web application in the same farm that have its site collection created from central administration, then I would also be able to see the 2013 workflows option.

I will continue to update this thread when (and if) I know more,.

Thanks, Joseph.