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Source:
p. 2, b. 23-49
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In A there are no cautionary flats before B
and d. The signs were added already in GE1 (→FE→EE, →GE2), probably together with a 
in the previous bar. Chopin's participation in this proofreading cannot be excluded, yet leaving an uncorrected mistake in the last two chords in the bar seems to indicate rather actions of the reviser, checking the correctness of the chromatic notation.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Authentic corrections of GE
notation: Pitch
Missing markers on sources:
GE1, A, GE1a, Morch, GE2, FE1, FE2, FES, FED, FEJ, EE1, EE2, EE3