I think the problem might be that endpoints don't know where to pull from. All you're doing with a webmention is parsing a URL, if that URL doesn't adequately define where the mention is the endpoint will likely get screwed up.
Take this for example:
https://starrwulfe.xyz/2024/01/wordpress-comments-fail/?replytocom=634
The ?replytocom=634 parameter tells **your** Wordpress where to scroll to but an endpoint will just see https://starrwulfe.xyz/2024/01/wordpress-comments-fail meaning that it will start looking from the top of the page and pull the wrong details.
I think you need to be sending a more literal URL like https://starrwulfe.xyz/2024/01/wordpress-comments-fail/#comment-635 to explicitly tell an endpoint where to look.
I could be wrong.
Colin Walker