In A (→GE1), FE and EE there is no 
returning f2 in the penultimate sixth. This patent error was noticed only in GE2 (→GE3) on the occasion of a thorough revision of accidentals – cf. the notes concerning the natural and flat before the previous sixth.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Errors in FE, Errors in EE, Omissions to cancel alteration, Errors in GE, GE revisions, Errors of A
notation: Pitch