There might be logic that says an 'old' link (> 12 hours say) with no comments doesn't need to be cross linked to if submitted later (or other rule).
In any case, @mods and @dang do not work (save by chance) .. if you think it's worth bring to attention then there's generally no downside to simply emailing direct to hn # ycombinator dot com from your login email.
https://news.ycombinator.com/item?id=41184948