This article appeared in the feed, but the "last answer" and "last comment" links point to https://community.intersystems.com/post/can-you-crack-black-box#node-432866 and https://community.intersystems.com/post/can-you-crack-black-box#comment-... which belong to a different post.
I'm still seeing this issue. The last answer/last comment links under each post on the front page link to the answers/comments on the black box post (currently the top post on the front page).
There was an issue with unclosed tags in the post. Now it is fixed and I think the bug solved too.