In A there is no 
lowering g1 to g
1 in bar 257 and both necessary flats in bar 260. The signs in bar 260 were added already in GE1 (→FE), whereas all three flats are included in EE and GE2.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Accidentals in different octaves, GE revisions, Omission of current key accidentals, Inaccuracies in A
notation: Pitch