This minimal gap may have been intentional, in order to show an interesting harmonic relation between the end of the scherzo and the beginning of the finale. The scherzo ends in A minor, the finale begins with G# major, and these chords share C as their third. The harmonic shift paradoxically suggests both diminishment and expansion.
As a partisan of the A/S order, I've thought for a while that it would be good to perform the work attacca, in order to show that the movement relationships do work when played this way. However, in concert, playing such a massive work in one gulp may not be possible!
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