Replacing the single f1 note with an f-f1 octave in FE (→EE) is certainly a change introduced by Chopin – cf. 1st mov., bar 348. However, the same cannot be said of printing this octave with notes of a normal size, in both bars. There had to be a misunderstanding at the time of implementing the proofreading, since adding this octave to the solo part is unimaginable, as far as the logic of the dialogue between the soloist and the orchestra is concerned.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Errors in FE, Errors resulting from corrections, Authentic corrections of FE
notation: Pitch