The version of the editions most probably resulted from revision and a mistake by the engraver of GE1 – after putting legato and the R.H. slur between the staves, there was no space left for the 
hairpin and the L.H. slur. He placed the hairpin under the stave and most probably forgot about the slur, which, moreover, was quite inconspicuous in A. In this situation, it is difficult to consider the additional wedge authentic.
FESB overlooked the first wedge.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in GE, GE revisions
notation: Articulation, Accents, Hairpins