The lack of slurs in FE (→GE,EE3) is certainly an engraver's oversight. Slurs in A, although imprecise, rise no doubts as to their intentional compass. This is further confirmed by Chopin's correction of a sketchy slur in bar 69 in A, precising its scope. Slurs in EE4, generally consistent with A, are nevertheless an undoubted editorial revision.
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category imprint: Differences between sources
issues: EE revisions, Errors in FE
notation: Slurs