Confusing Messaging regarding the WP Base Page
This issue at SE - https://civicrm.stackexchange.com/questions/37954/wordpress-base-page-error details that the existing messaging on the CMS database integration as well as the system alert can make it sound like
http://example.org as the base page is fine. It's not.
Help Text on CMS Database Integration:
By default, CiviCRM will generate front-facing pages using the home page at http://wpcvmaster.test/ as its base. If you want to use a different template for CiviCRM pages, set the path here.
In both cases it says that we will use
http://wpcvmaster.test/ and that will fail.
We'll need to update the text and the related documentation