In FE1, the 
raising b
1 to b1 is only in the 3rd group of semiquavers. The error was corrected in FE2 by adding a relevant also in the 2nd group. The mistake was also corrected by revisers of GE and EE, who moved the sign from the 3rd beat to the 2nd. In the main text we give both signs due to graphic reasons (division of the bar between two lines of the text).
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Errors in FE, GE revisions, Authentic corrections of FE
notation: Pitch