The problem was that WordPress uses these functions based on post_date …
I did an import from an old CMS to WordPress where I just added all posts within a loop. Some of the dates were a few seconds off. This caused the functions to return ‘false’ posts.
I actually wrote a custom class that handles getNext() and getPrevious() with a combined function called getSiblings() based on post_id.
I actually wrote a class that fully tackles this problem. Check github for the full code. Contribution would be very much appreciated 🙂
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