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Source:
p. 2, b. 17-34
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Chopin changed the original version (written in A) while proofreading FE (→GE1→GE2, →EE2→EE3). At the time of proofreading, the unnecessary 
before e1 in the 2nd half of the bar was left. This may have incited the reviser of GE3 (→GE4→GE5) to change e1 to e1 in the chord at the beginning of the bar (this totally arbitrary version was also repeated in EE4).
We add a cautionary 
before f1 on the 2nd semiquaver.
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, GE revisions, Cautionary accidentals, Authentic corrections of FE
notation: Pitch
Missing markers on sources:
A, FE1, FE2, FED, FEJ, FES, GE1a, GE2, GE3, GE4, GE5, EE2, EE3, EE4, GE1