I can't add comments to blog posts released before the migration

Let's say I want to reply to https://blog.torproject.org/comment/268422#comment-268422 now after our migration is over. Somewhat surprisingly there seems to be no way to do so. There are no "Delete Edit Reply Approve" buttons on that comment available for me. I am logged in and replying to comments works for me with the https://blog.torproject.org/blog/we-are-upgrading-our-blog entry.