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I have two custom post types: articles and authors.
I’ve created a relationship field so that when I edit articles, I can select an author from the list of custom posts. When I add or edit an article, the lists of authors displays OK in the metabox, except if I have an author with no Title field added (I have custom fields for first and last names).
In the example screenshot below, I have three author posts with titles, and one without, which displays above “anonymous” (in the box on the left):
Example screenshot
Although I could enter a title, there are use-cases where I might not want to.