In Atut, the R.H. part is written in this bar twice, most probably due to the non-inclusion of the bottom voice on the 3rd beat of the bar for the 1st time. In the corrected version, Chopin, however, overlooked the 
mark, which was not included in the same FE (→GE,EE). According to us, it is highly unlikely that it was an omission – the composer forgot about the mark, since he was focused on those elements that required improvements, e.g. beams of the quavers in the melodic line.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Corrections in A, Errors resulting from corrections
notation: Articulation, Accents, Hairpins