Nacdor

I have noticed that many accounts (like mine) have an automatic ranking penalty applied when commenting. Rather than being placed at the top of the list with other new comments for a short period of time, they're automatically pushed to the bottom. It's similar to a shadowban but the comments are still visible to everyone.

What is the name for this and is it documented anywhere? I've seen several posts that discuss "undocumented" features of HN but so far none of them have mentioned this.