Among the four source versions of the slurring, only the first two – GC and EE and FE – are probably authentic. The version of GE1 is certainly erroneous – the engraver confused the bars and inserted the division of the slur one bar too late. In turn, the reviser of GE2 (→GE3) probably assumed that the slur of the grace note and the phrasing slur, which merge in GC, create one slur beginning from the grace note.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Errors in GE, GE revisions, Inaccuracies in GC
notation: Slurs