Ticket #52889: link-template.diff

src/wp-includes/link-template.php

@@ -101 +101 @@
  * @return bool Whether to use a plain permalink structure.
  */
 function wp_force_plain_post_permalink( $post = null, $sample = null ) {
+        /**
+         * Filters whether to disable forced plain post permalinks.
+         *
+         * If disabled, wp_force_plain_post_permalink will always return false.
+         *
+         * @since 5.7.1
+         *
+         * @param bool $disabled Whether forced plain post parmalinks should be disabled.
+         */
+        if ( apply_filters( 'forced_plain_post_permalinks_disabled', false ) ) {
+                return false;
+        }
         if (
                 null === $sample &&
                 is_object( $post ) &&