In AsI and A, there is a 
to B
(cautionary?) before the last octave in bar 255. In GE (→FE,EE), another one was added, to B1. In the main text we omit these unjustified accidentals.
At the beginning of bar 256, in the manuscripts there is also an accidental only to the top note of the L.H. octave. A natural to the bottom note was added already by GE (→FE,EE).
Compare the passage in the sources »
category imprint: Differences between sources; Editorial revisions
issues: GE revisions, Cautionary accidentals
notation: Pitch