The change of the inner note in the 4th chord in bar 7 from e
1 written in A to f1 featured in FE (→GE,EE) is most probably a result of Chopin's correction. The composer could have striven for a smoother combination of this chord with the next one, without a progression of parallel fifths. According to us, the correction intentionally concerns also two repetitions of this place, in bars 15 and 39 (Chopin omitted one of a few similar places at the time of proofreading on a number of occasions, e.g., in the Etude in G major, No. 5, bar 4).
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Authentic corrections of FE, Omitted correction of an analogous place
notation: Pitch