In A (→GE1) and FE there is no natural raising d1 into d1. In this context, it is undoubtedly Chopin's oversight, one of the most common. The natural was added in all 3 pupils' copies. In GE2 a flat was added in front of the upper note, which was corrected in GE3 (→GE4). EE has doubly erroneous version, caused probably by Chopin's manner of writing seconds vertically and not diagonally.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Annotations in teaching copies, Errors in EE, GE revisions, Omission of current key accidentals
notation: Pitch