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