Unable to tag users in reply to comments

Question

For this question here, How can international students with weak work experience overcome logistical difficulties in seeking work in the United States? , I am unable to tag users as I want to reply to the user who posted the second answer with a clarification.

Typing the @ symbol and the first few letters of his name, does not trigger the autocompletion request. Manually typing his name after the @ symbol does not work either as after I hit save, the @symbol followed by the user name disappears. Could this be a bug?

Answer 1

The owner of the post is automatically notified of all comments on it, so the system "helpfully" removes your "@author-name" text as redundant. This trips up lots of people; you are not alone. The author will get your message, so go ahead and comment.

See How do comment @replies work? for more information.