The 2nd small quaver in FE (→EE1) is an erroneous b1, which we interpret as b
1, since overlooked accidentals are much more common than Terzverschreibung mistakes. This is how this place was revised in EE2 (→EE3), by adding a 
before that note. The correction in ink performed in FESf restores the correct pitch of that note, i.e. g1.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Errors in FE, Errors repeated in EE
notation: Pitch