I tried creating a Hiera config page on wikitech with the Hiera:Project/host/Hostname pattern, and got this: There is currently no text in this page. You can search for this page title in other pages, or search the related logs, but you do not have permission to create this page.
When I try to create it like wikitech.wikimedia.org/Hiera:Project - it works fine and I can edit.
Specific links used:
Cannot edit: https://wikitech.wikimedia.org/wiki/Hiera:Dashiki/host/dashiki-staging-01
Can edit: https://wikitech.wikimedia.org/wiki/Hiera:Dashiki