Issues : Omission of current key accidentals

b. 24

composition: Op. 28 No. 12, Prelude in G♯ minor

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In A (→FC,FE) there is not a single  before the a notes (in various octaves). Such oversights of accidentals defining the current key are among the most frequent mistakes of Chopin. The accidentals were added in GE and EE. The same applies to the next three bars. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Omission of current key accidentals , Errors of A , Last key signature sign , Errors repeated in FE

b. 25-27

composition: Op. 28 No. 12, Prelude in G♯ minor

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As was the case with b. 24, in A (→FC,FE) there is not a single  before the a notes (in various octaves). The accidentals were added in EE (all) and in GE (except a1 in b. 26 and a in b. 27).
See also bars 27-32.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Omission of current key accidentals , Errors of A , Last key signature sign , Errors repeated in GE , Errors repeated in FE