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Source:
p. 2, b. 17-34
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In the chord in the middle of the bar, Chopin overlooked the 
returning b in A. However, two notes later he added a cautionary natural before a (arranged a little bit too high).
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category imprint: Interpretations within context; Differences between sources
issues: Omissions to cancel alteration, Errors of A, Authentic corrections of FE, Accidental below/above the note, Last key signature sign
notation: Pitch
Missing markers on sources:
A, FE1, FE2, FED, FEJ, FES, GE1a, GE2, GE3, GE4, GE5, EE2, EE3, EE4, GE1