Page:
Source:
p. 2, b. 20-40
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Before the top note on the 7th semiquaver, the 
returning f
is only in GE4 (→GE5). It means the sound of f in AI and in the aforementioned GE, and f in the remaining sources. However, there is no doubt that the missing is Chopin's oversight, related to the correction on the 2nd semiquaver.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Omissions to cancel alteration, Errors resulting from corrections, GE revisions, Errors of A
notation: Pitch
Missing markers on sources:
A, AI, FE1, FE2, FED, FEJ, FES, GE1a, GE2, GE3, GE4, GE5, EE2, EE3, EE4, GE1