The sources do not contain an accidental before the top note of the third on the 4th quaver in the bar, as a result of which it should be interpreted as e-g
. It must be Chopin's inadvertence – the characteristic f(-d1) – e-g – e-a sequence appears 10 times throughout the Prelude (excluding this place), always with g, even when it is preceded by a g-e sixth (in b. 41). Analogous sequences are to be found on a number of occasions also in other harmonic contexts, always with a minor third on the second quaver. Therefore, Chopin was fully entitled to consider the 
to be obvious in this place.
Compare the passage in the sources»
category imprint: Interpretations within context; Editorial revisions
issues: Omissions to cancel alteration, Errors of A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch