Issues : Errors of A

b. 21

composition: Op. 28 No. 8, Prelude in F♯ minor

..

The fourth demisemiquaver of the 3rd group and the 3rd note of the 4th group should be interpreted in A (→FCGE) as g2, since there are no accidentals next to them, and the note at this pitch in the 2nd group is provided with a . Both the harmonic context and the rule of the figurations' structure applied in a vast majority of the cases (cf. b. 4 and 13) are strong arguments in favour of the assumption that Chopin overlooked the  restoring g2. The accidental was added in FE (→EE). 

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of A , FE revisions , Errors repeated in GE