(d
The sound of the penultimate semiquaver, devoid of an accidental in FE (→EE,GE1→GE2), may raise doubts. When interpreted literally, it is a d
3 due to the valid 
before the 2nd semiquaver. This version, satisfying from the harmonic point of view – d3 = e3 is a chord element, as in all similarly structured figures in bars 315-318 – must be considered the basic one.
On the other hand, seeing e2 in the chord in the L.H., it is easy to forget about the previous and read this note as a d
3. It is even more likely, since in the version with d3, the last four semiquavers reproduce the melodic and pianistic scheme shaped in the two previous figures. Such oversights of cancellations of alterations are one of the most frequent mistakes of Chopin, most probably committed shortly before – the 
restoring b2 on the 8th semiquaver in the bar was almost certainly added in FE only at the stage of proofreading, hence it was absent in [A].
In this case, the absence of annotations in the pupils' copies cannot be considered an argument, since a non-standard enharmonic notation does not guarantee that the pupils performed the formally written text (with d3) or still less, that they performed what it seems to be at first glance, i.e. d3.
All in all, in the main text, we give the version with d3, adding a reminding before this note (such an addition was introduced already in GE3). We suggest the version with d3 as an acceptable variant.
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category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Omissions to cancel alteration, GE revisions
notation: Pitch