The comparison of the slurs in A and GE (→FE→EE) points to inaccurate reading of the manuscript by the engraver of GE1: although in bar 67 (opening a new page of A) the slur beginning may suggest continuation from the previous bar, but no slur can be found in bar 66 that could be continued. It is not unlikely that the engraver, having a new page of A ready for work, did not want to return to the previous page to check slurring and adopted the simplest solution based only on the shape of the slur in bar 67.
The fact that the inaccurately read slur turned out to comply with Chopin's corrections of analogous slurs in bars 58-59 and 62-63 may be considered a happy coincidence. Perhaps only when he noticed differences in slurring in the initial version of GE1 (slurs running from the 1st notes of bars 59 and 63, but from the last note of bar 66) did Chopin decide to correct phrasing in the two earlier places. Cf. the note to bar 59.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Interpretations within context; Differences between sources
issues: Inaccurate slurs in A
notation: Slurs