In A there is no accidental before the 1st note in the 4th group of demisemiquavers, which should therefore be interpreted as a
1. A comparison with analogous b. 1 proves Chopin's mistake; it is also the 
before the next a2 that confirms a1 as the intended pitch of that note. The natural was added in FC and FE (→EE); however, it is absent in GE, which is probably an oversight of the engraver.
We omit the cautionary before a2 in the main text.
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