In JC there is no 
lowering a3 into a3, which is a patent error; in the copy there is also no relevant sign before a2. PE is also missing a flat before the latter, which can correspond to the notation of [A], as Chopin often extended the validity of cautionary accidentals onto entire passages or scales of this kind.
The same applies to bar 46, marked in the sources as a repetition of bar 19.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Accidentals in different octaves, Omission of current key accidentals, Errors of JC, Inaccuracies in PE
notation: Pitch