Yes, this sounds like a bug and I've been able to reproduce it internally.
Please contact Support (firstname.lastname@example.org) so they can gather more information and determine how much this is impacting you and your organization.
I am also facing the same issue. But this works fine in Tableau 7 LIVE connection and TDE & Tableau 8 LIVE. Issue is only with the Tableau 8 TDE.
Did you get any update from support for this issue ?
Hi Jaan. No real resolution. It appears that the elements of the parameter managed in the report book trump the elements created in the datasource.