According to us, regardless of how the difference occurred (in the sources there are no clear traces of possible corrections in this regard), omission of the 
hairpins in FE was a conscious and final decision of Chopin. In Chopin notation, this kind of sign emphasises the note or group of notes, which in this case would suggest beginning the phrase of the middle voice together with the return of the main thematic link in this part, contrary to the later, consistent markings of FE.
Extension of the sign in GE2 (→GE3) is a typical for this editor routine revision.
Compare the passage in the sources »
category imprint: Differences between sources
issues: GE revisions
notation: Articulation, Accents, Hairpins