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Source:
p. 2, b. 17-32
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GC (→GE1) and FE have a 
before b
1 at the beginning of the bar. The sign is unnecessary here, however, it points to Chopin's way of thinking, who probably already here heard the C minor key, prevailing in bars 21-24. The sign was overlooked in EE, which most probably is a result of an oversight (in EE1 the next before a1 is also absent), and deleted in GE2 (→GE3), which is a reasonable revision in this context.
Compare the passage in the sources»
category imprint: Differences between sources
issues: GE revisions
notation: Pitch
Missing markers on sources:
GC, FES, EE1, EE2, EE3, FE1, FE2, GE3, FED, FEJ, GE1, GE1a, GE2, GE1b