b. 67
The missing accidental to the 12th semiquaver formally means that it is a G1. However, in similar contexts, Chopin would often consider the accidentals to the same note in a different octave in a given bar to still be valid. Taking into account the 4th semiquaver, G, the discussed note should rather be deemed G1. The revisers of GE and EE1 differed on this issue; the change introduced by EE2 could have been inspired by the GE1 text.
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, Accidentals in different octaves, GE revisions, Inaccuracies in A
notation: Pitch