In A it is unclear what the rhythmic value of the c2 note is – it can be considered a crotchet or a slashed grace note. We regard the first possibility as the more likely one, since the corresponding note in the oboe and clarinet parts in Morch has the same value. If we were to consider c2 a grace note, it would be difficult to explain why the remaining notes in the R.H. are written as the bottom voice (with stems pointing downwards); moreover, the slash of a grace note is usually led from bottom to top and from top to bottom.
The dotted minim in FE is most probably a result of a revision – the change was performed in the moment when the note was preceded by the erroneous flat, which Chopin would have certainly noticed. In turn, one can imagine a reviser checking the rhythmic correctness of the notation, who would not be considering the sound of the chord.
Another extension of this note in EE is certainly an editorial revision.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: EE revisions, FE revisions, Inaccuracies in A
notation: Rhythm