The naturals and flats added in FE (→GE,EE) change the chord on which the 1st half of the bar is based. Despite numerous missing accidentals in A, it seems to be highly unlikely that the proofreading was only a correction of an inaccurate notation. Apparently, at the stage of writing A, Chopin heard d
from the beginning of bar 68, same as in respective bar 66 (bars 67-68 constitute a modified repetition of bars 65-66).
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE
notation: Pitch