Player names and [item] don't update fast enough

If you send a message in containing [i] or [item] (or other equivalents) in chat shortly after they have been altered (like switching the item being held in your main hand in the case of [i]), the item in question will be the last thing you previously held (or if nothing was held, it will just display the original text instead). The same also applies if you send a message shortly after you have changed your nickname, even though the player list displayed when holding Tab has updated with the new name.