But if you were asked to spell the words, you'd produce something close to what was expected, rather than drawing a blank. The question "how do you spell wiedersehen" contains in itself a lot of clues.
This feels more like "what's the Unicode character for 'full moon'?" I'd be able to recognize the result as correct, but if I don't know the answer, I just don't know.
(Of course, that goes too far in the other direction. I assume you can draw a few strokes to "get someone started" on a character and they'll pick it up, whereas most people wouldn't recognize the first half of a Unicode code point. As the grandparent poster said, it's an exotic problem that's hard to empathize with in phonetic languages)