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The absence of the 
raising the top note of the mordent from a2 to a
2 in the sources is almost certainly an inaccuracy in this context. Such imprecise notation of ornaments – grace notes, mordents, trills or turns – is a quite frequent phenomenon in Chopin's pieces, cf. e.g. the Nocturne in C minor, op. 27, no. 1, bar 75 or the Sonata in B
minor, op. 35, the 2nd mov., bar 54.
Compare the passage in the sources »
category imprint: Interpretations within context
issues: Inaccuracies in FE, Omission of current key accidentals, Errors repeated in GE, Errors repeated in EE
notation: Ornaments