WebSudo prompt for "add project" doesn't redirect to "add project" dialog

Do either of the following in BTF (WebSudo is disabled in OnDemand):

1) Create a new clean instance and complete setup.
2) Log in and go to the dashboard.
The Welcome Dialog pops up and invites you to create a project
3) Click the "Create a project" button.
You get the WebSudo login prompt.
4) Authenticate to WebSudo.
Instead of showing the "Add Project" dialog, it reloads the page and shows the welcome dialog again instead.

Or

1) Log in to an existing BTF instance.
2) Go to Administration.
3) Click "View All Projects"
4) Click the "Add Project" button
The WebSudo login prompt comes up.
5) Authenticate to WebSudo.
Instead of showign the "Add Project" dialog, it reloads the page and just shows the project listing again.

Affects 5.0.6 and 5.0.5 but not 5.0.3 or master.

Please check why this wasn't caught by the WebDriver tests, this is a pretty basic regression.