TL;DR WordPress 6.9 introduced a fix for adjacent post navigation when posts have identical publication dates. While this resolved a long-standing bug, it inadvertently caused infinite loops in some extensions that modify the get_adjacent_post() WHERE clause. What Changed in WordPress 6.9 In WordPress 6.9 (Trac #8107), a bug fix landed where next/previous post navigation failed … Continue reading Adjacent Post Navigation Changes in WordPress 6.9 and Compatibility Issues