In A there is no accidental before the 1st note in the 4th group of demisemiquavers, which should therefore be interpreted as a
1. It is a patent mistake – cf. analog. b. 1 – corrected in FC and FE (→EE). However, there is no natural in GE, which seems unreasonable if we take into account its presence in the Stichvorlage (FC) and a quite detailed revision performed in that edition.
It is tempting to think that the accidental in FC is one of the later additions of H. Scholtz; however, on the preserved photograph, it seems that it was written with a pen, and not in pencil, like the remaining additions. Unlike in analog. b. 1, in which Chopin crossed out the dispensable 
before a2, here the before that note was not crossed out. Next to the oversight of the accidental before a1, it proves that the composer was significantly distracted when writing the 2nd half of that bar.
We omit the cautionary before a2 in the main text.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Source & stylistic information
issues: Errors in GE, Cautionary accidentals, Errors of A, FE revisions, Fontana's revisions
notation: Pitch