The sources differ in the details of the notation of "harmonic legato". In the previous version, the second semiquavers of the groups are extended to the value of a crotchet, except for the last group in bar 21, in which there is no relevant extension (see also the note related to bar 22). In the later version of PE, all those notes are dotted quavers. One could wonder whether Chopin changed here the performance (the second notes of each group were supposed to slightly overlap the next harmony in the previous version) or he just improved the notation, bearing in mind the same performance from the beginning (therefore, the original notation would be simpler, yet less precise).
In GEF there are no extensions in the 1st group in bar 21, which is a patent error (cf. analogous bar 48, in which the relevant extensions are marked).
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in Fontana's editions
notation: Rhythm