I studied music theory and composition in college, so at one time I was at least somewhat practiced in reading and writing scores. My impression is that when you hear something aloud it's nearly always different to some degree from what you imagined in your head — and I don't think even someone like Beethoven escaped this entirely. I feel confident that he would have made minor adjustments to many of the late works he was never able to hear — he was known as a "reviser" in his working methods anyway.
My best evidence for this is the weird harmonic rhythm of the second movement of Sonata #32. ("Harmonic rhythm" is a technical term having to do with where we perceive a move from chord to chord.) The harmonies change at odd points. I don't believe that the effect was entirely deliberate — I think he meant for the harmonic rhythm to be straightforward and merely to anticipate with some melodic gestures. He was probably experimenting, but when you do something unusual, that's when feedback is even more important.
When I read that sonata, though, the harmonic rhythm I hear in my head doesn't seem off. The barlines provide a downbeat, and the apparent harmonies from the melodic gestures don't override it.