Wordpress güncellemesi ile hiçbir eklenti kullanmadan bile test yapılsa, wordpress yorumlardan kaynaklı olarak
wp-includes/js/comment-reply.min.js

Pagespeed kısmında yer alan bu uyarıdan kurtulmak için;

function.php

function wp_dereg_script_comment_reply(){wp_deregister_script( 'comment-reply' );}
add_action('init','wp_dereg_script_comment_reply');

add_action('wp_head', 'wp_reload_script_comment_reply');
function wp_reload_script_comment_reply() {
    ?>
<script>
//Function checks if a given script is already loaded
function isScriptLoaded(src){
    return document.querySelector('script[src="' + src + '"]') ? true : false;
}
//When a reply link is clicked, check if reply-script is loaded. If not, load it and emulate the click
var repLinks = document.getElementsByClassName("comment-reply-link");
for (var i=0; i < repLinks.length; i++) {
    repLinks[i].onclick = function() { 
    if(!(isScriptLoaded("/wp-includes/js/comment-reply.min.js"))){
        var script = document.createElement('script');
        script.src = "/wp-includes/js/comment-reply.min.js";
    script.onload = emRepClick(event.target.getAttribute('data-commentid'));        
        document.head.appendChild(script);
    }
}
};
//Function waits 50 ms before it emulates a click on the relevant reply link now that the reply script is loaded
function emRepClick(comId) {
sleep(50).then(() => {
document.querySelectorAll('[data-commentid="'+comId+'"]')[0].dispatchEvent(new Event('click'));
});
}
//Function does nothing, for a given amount of time
function sleep (time) {
  return new Promise((resolve) => setTimeout(resolve, time));
}
</script>
    <?php
}

kodunu eklerseniz bu sorundan kurtulmuş olursunuz.