In other words, they are asking a question which seems to them like the right question to ask ("How do I get to point B from point A?") when they are really at point A and are trying to get to point C.
They think they should just ask for directions to point B but if they asked how to get from point A to C, there may very well be a better answer thank first asking how to go A=>B (and eventually asking about B=>C).
I feel I read a 'fancy' name for this — a law, theorem, or fallacy of some sort and cannot find it again :(
Thanks in advance for you help!