While designing a site I found that every Home page would display an error message "There was a problem displaying the preview" and investigating the CSS shows that portalbasictheme.css no longer is applied to brand new sites and displays a "default css disabled" error. After going to portal management and manually adding portalbasictheme.css to a site, the disabled css error goes away, but the home page still shows the preview error. If I preview the site, the home page appears functional - I just can't edit the home page from the power pages designer. I'm also able to edit using the classic power apps portal designer.
This is the case for every new power pages site I create now - the default css web files are missing the portalbasictheme.css file, and the designer shows an error when trying to edit the home page. Is there a setting that I can use to resolve this?
