The unquestionable long accent written in A was reproduced in GE as short and in FE (→EE1) it was overlooked. There seems to be no reason to attribute any of these changes to Chopin's intervention. In subsequent EE the accent was most probably added after GE.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Long accents, EE revisions, Errors in FE, Inaccuracies in GE
notation: Articulation, Accents, Hairpins