Only thing I can think of is this block in functions.php maybe?
add_filter( 'discourse_comment_html', function () {
ob_start(); ?>
<li class="comment depth-1">
<article class="comment-body">
<header class="comment-header">
<img
src="{avatar_url}"
alt="{username} avatar"
class="comment-avatar"
width="40" height="40" loading="lazy"
/>
<div class="comment-meta">
<b class="fn">
<a href="{topic_url}" rel="external">{username}</a>
</b>
<time datetime="{comment_created_at}">
{comment_created_at}
</time>
</div>
</header>
<div class="comment-content">
{comment_body}
</div>
</article>
</li>
<?php
return ob_get_clean();
} );