Chopin changed the rhythm of A while proofreading FE (there are visible traces of this change). The withdrawal from the rhythmic underlining of the topmost note of the passage may be related to a minor change in the Etude's concept, revealed also in increasing its tempo. See also bars 30 and 32.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE, Dotted or even rhythm
notation: Rhythm
