The version of A (→FE1) – with g
2 on the 1st quaver – although theoretically possible – is, according to us, most probably erroneous. Anyways, in the proofreading of FE2 (→EE), the 
from before the 2nd quaver was moved over the first, almost certainly at Chopin's order. The sign was added also in GE, which is most probably an opportune revision of the editor. Cf. bar 76.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: GE revisions, Errors of A, Authentic corrections of FE
notation: Pitch
