Ticket #54736: get_sample_permalink_post_filter_null.patch

src/wp-admin/includes/post.php

@@ -1435 +1435 @@
         $post->post_status = $original_status;
         $post->post_date   = $original_date;
         $post->post_name   = $original_name;
-        unset( $post->filter );
+        $post->filter      = null;
 
         /**
          * Filters the sample permalink.