The bottom note of the 2nd semiquaver is written in AI as e
, while before the bottom note of the next semiquaver there is no 
returning e. In the context of a more precise notation of the later sources, the lack of must be considered as a mistake, in spite of the fact that from the purely harmonic point of view, the version with the repeated e would not be entirely impossible (although rather not in the stylistics of young Chopin, who showed a clear preference for diminished four-note chords). In A one can see traces of change of this e to f. Cf. the Prelude in C minor, Op. 45, bar 79.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Enharmonic corrections
notation: Pitch