I don't think anybody misunderstands the original usage.
I think that most people don't care in the slightest how something Aristotle wrote in Greek was translated into Latin and then awkwardly translated from Latin into English in the 1500s, into an archaic predecessor of modern English that is almost but not quite intelligible to the modern ear. Prior Analytics is not the Bible, it doesn't have to be quoted verbatim in whatever translation you favor to keep Aristotle from smiting you with thunderbolts or some such.
I've definitely never met anyone who used it to mean "I'm about to ask another question" who was aware of the original meaning of the phrase when asked, so we must live at antipodes.
I think that most people don't care in the slightest how something Aristotle wrote in Greek was translated into Latin and then awkwardly translated from Latin into English in the 1500s, into an archaic predecessor of modern English that is almost but not quite intelligible to the modern ear. Prior Analytics is not the Bible, it doesn't have to be quoted verbatim in whatever translation you favor to keep Aristotle from smiting you with thunderbolts or some such.