The 
restoring b
1 in the 2nd half of the bar is absent in all sources. It must be Chopin's mistake, one of his most frequent errors.
Compare the passage in the sources »
category imprint: Interpretations within context; Editorial revisions
issues: Omissions to cancel alteration, Errors of A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch