The version with f
1, although harmonically possible, is, however, most probably erroneous – in the entire Prelude, in the vast majority of the eight-note figures, the 3rd demisemiquaver is placed a half a tone lower than the 5th one. Therefore, the natural added in FE2 (→EE) is most probably an accurate addition, although Chopin's participation in that intervention is uncertain.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Omissions to cancel alteration, Errors of A, FE revisions
notation: Pitch