Newest comments first not working

You have no need callback function. Only reverse_top_level: true is find for what you want to do. Just remove ‘callback’ => ‘custom_comments_callback’, from your array.

<?php wp_list_comments(array(
   'reverse_top_level' => true,
   'avatar_size'   =>  50,
   'reply_text'    =>  'Reply to this comment'
)); ?>

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