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Source:
p. 27, b. 600-620
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The version of EE is almost certainly erroneous – the presence of a
and a2 proves that from that moment on, Chopin heard again the E minor key and not F major. Interestingly, the reviser of EE did not react in the previous bar, in which he should have added the overlooked 
lowering f2 to f2. A cautionary 
before that note was added in GE3.
Compare the passage in the sources»
category imprint: Differences between sources
issues: EE revisions, GE revisions
notation: Pitch
Missing markers on sources:
GE1, GE2, FE1, FED, FEH, FEJ, FES, GE3, EE1, EE2, EE3, Atut, GE2a, FEFo