Authors widget compatibility

If you’re using the guest authors feature of Co-Authors Plus, I’d recommend asking the Authors plugin author to add a filter to widget_authors_get_authors() (ref). Guest authors are actually stored as a custom post type, so you’d need to filter them into the result. It will require some custom PHP.

Hi and thanks for looking into this so quickly!

Yes I am using guest authors too, but in this case it is just a regular co-author. Only the first listed author for each article is listed in the widget, not the second, the co-author.

For example you can see the two authors here, where only the first is listed in the widget on the first page: https://www.hroarr.com/follow-some-lessons-with-dagger-and-rapier/

It looks like the Author plugin has a dependency on count_many_users_posts(), and each author having at least one published post. Because the second author is stored as a taxonomy reference, if that second author is never stored as a first author WordPress won’t know that the author has published posts.

A simple test would be to publish one post with the second author as the first author, and see if the author will appear.