Hmm I just tested this myself and got the same result... that bug was specifically about the Sent folder, which is probably why it was fixed as this doesn't appear in the sent folder.
I would file a new bug about this if I were you. It looks like they had this problem in the Connector for Outlook which is
Bug 13098 - replying (via reply all) to a message includes you but you are talking about the web client itself, not any connector. It also isn't a duplicate of 4286 since that is specifically about the sent folder.