In 'Worksite Setup' > 'New', there is a radio button labeled "Build your own site". The intention is that you can choose to create a site from a pre-built template.
In 10.3, this radio button was surrounded by a conditional:
This conditional was removed in the 11 code base (
SAK-25867), causing a regression whereby the radio button will always be displayed, even if there are no templates to build a site from.