IE1
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The additional FE slur could be a mistake or an erroneous revision – we know of similar situations in which engravers would add an allegedly missing slur/tie when a few notes of adjacent chords are combined by authentic slurs/ties, e.g. in the Mazurka in D, Op. 33 No. 3, bars 8-9 and 24-25 or in the Mazurka in B, Op. 41. No. 2, bars 4-5 and analog.
See also bar 61.
Compare the passage in the sources »
category imprint: Differences between sources
issues: FE revisions
notation: Slurs