I recently refactored a website to use the newly recommended gatsby-source-prismic plugin instead of the soon-to-be-deprecated gatsby-source-prismic-graphql plugin. I am still having issues trying to get previews to work. I followed the documentation of the four-step process to get previews setup and when I try to preview something that isn't published it states there isn't a page that exists with the specified page route.
This is what happens when I try to preview two different content-types: