The fact of beginning the slur from the 2nd group of semiquavers is almost certainly an inaccuracy of notation, which probably follows from [A]. Different versions of the slur's ending in EE and GE2 (→GE3) are certainly a result of the engravers' errors. The omission of the slur in GE4 (→GE5) may be considered as an oversight or revision.
Compare the passage in the sources »
category imprint: Differences between sources; Editorial revisions
issues: Inaccuracies in FE, Errors in GE, GE revisions, EE inaccuracies
notation: Slurs