Shifting the 
hairpin so that it starts from an upbeat, is, according to us, rather an inaccuracy of the engraver of FE, hence, in the main text we give the undoubtedly authentic sign of A. However, since an alternative possibility of Chopin's proofreading in FE cannot be entirely excluded, the version of FE, repeated in all remaining editions except for GE2no2, can be considered to be a potentially authentic variant. In turn, shortening the sign in GE2no2 is undoubtedly a revision, as a part of which the signs in all analogous bars were unified (bars 1-2, 5-6, 17-18 and 21-22).
Compare the passage in the sources»
category imprint: Differences between sources
issues: Inaccuracies in FE, Scope of dynamic hairpins, GE revisions, Authentic corrections of FE
notation: Articulation, Accents, Hairpins