In AI and FE (→EE2) there is no before the upper note of the octave (b2). This patent – and typical – inaccuracy of Chopin's notation was corrected in GE and EE3 (→EE4).
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions, Errors in FE, Accidentals in different octaves, GE revisions, Errors of A
notation: Pitch