The b
1 note in FE1 must be a mistake of the engraver, corrected in FE2 (probably by Chopin). The correct version in GE and EE may mean that it was also the bases for these editions that included Chopinesque corrections; however, it is uncertain, since such a mistake could have been detected by the reviser thanks to the very regular structure of the passages of this section.
In A, one can see another deleted note between the f1 and d2 quavers, most probably b1. The gaps between the notes in the entire group suggest that it was not replaced by d2, but removed from the initial version of the passage, which probably did not include the 2nd quaver, d1: 
.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations; Source & stylistic information
issues: EE revisions, Errors in FE, Corrections in A, Terzverschreibung error, GE revisions, Deletions in A, Authentic corrections of FE, Main-line changes
notation: Pitch