A (→FE1) has no accidentals in this bar. Chopin added the overlooked naturals before the 3rd L.H. octave (B-b) in GC (→GE) and FE2 (→FE3). The signs were also added in EE, most probably by analogy with bar 149.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Omission of current key accidentals, Errors of A, Authentic corrections of FE, Authentic corrections in GC
notation: Pitch