In the main text we give 
there, where Chopin wrote it in A, as emphasising the appearance of a figuration based on a new, dissonating chord seems to be justified. However, the interpretation adopted in the editions does not have to be erroneous, as Chopin would often use the notation in which such placed dynamic mark is binding from the beginning of the bar, cf., e.g., the Etude in C major, No. 1 bar 45.
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category imprint: Differences between sources
issues: Inaccuracies in FE, Centrally placed marks
notation: Verbal indications