The sources do not include a 
restoring b
on the 3rd beat of the bar, which means that this accidental was also absent in [A]. In the main text, we correct this oversight, patent in this harmonic context and generally fairly typical of Chopin.
Compare the passage in the sources »
category imprint: Editorial revisions
issues: Omissions to cancel alteration, Errors of A, Errors of FC, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch