The absence of the 
sign in A is almost certainly a mistake – in analogous bar 32 a respective sign is written. The addition of a in FE may be attributed to Chopin's proofreading, although the placement of the sign – under the rest and not after it, as in bar 32 – raises certain doubts, as far as the accuracy of reproducing the composer's intention is concerned. In the main text, we stick to the notation of A in bar 32.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Errors of A, Authentic corrections of FE
notation: Pedalling