The last note in the 1st L.H. figure was probably written down as g in A, which Chopin then turned to b; eventually, he crossed it out and rewrote b. As is the case with many similar situations, it is not preceded by a 
, which was corrected in FC (→GE) and EE.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Corrections & alterations; Source & stylistic information
issues: EE revisions, Accidentals in different octaves, Fontana's revisions, Errors repeated in FE
notation: Pitch