The extent of the slur in the L.H. that begins in A on the 3rd crotchet of bar 56 is not quite clear. In the editors' opinion that slur probably led to the deleted chord at the beginning of bar 57. In GE1 (→FE) it was brought as far as the 2nd crotchet, which does not follow in any way from A. That notation, incomprehensible in the context, was changed in EE, as well as in GE2 (→GE3) in the manner that we consider to be the most proper reading of A.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: EE revisions, Inaccuracies in GE, Inaccurate slurs in A
notation: Slurs