A has an a
1 as the last note in the L.H. It is almost certainly a mistake – cf. analogous figures in bars 300, 302 and 304-306. Mistakes in the number of ledger lines are the most frequent pitch errors committed by Chopin (excluding those related to the notation of accidentals). GE (→FE→EE) features the correct text, which can be ascribed to Chopin's proofreading or a fortunate mistake, since there are no visible traces of correction in print, whereas the note in A, despite three ledger lines, is written lower than the previous g1.
In the discussed place, there is a visible correction in A. The deletions are actually very precise, yet their placement allows us to indicate e1 and d1 as possibly crossed out original (or only erroneous) last two notes.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Errors resulting from corrections, Terzverschreibung error, Errors in the number of ledger lines, Errors of A, Authentic corrections of GE
notation: Pitch