Guest authors will never appear when has_published_posts user query var is used #145
Description
The WP_User_Query class allows for a query var called has_published_posts that accepts an array of post types.
The direct result of using the var is that WordPress will add a sub query that finds all post_author values for published posts matching the post types to the WHERE clause.
The post_author column is of course the actual author, not the ones assigned via this plugin, so guest authors will never be returned in this instance.
Ideally we can find a way to make this work how you'd expect.
As it stands this is resulting in SEO plugins like Yoast exclude all guest authors from the author sitemaps.