The FC accent was most probably written by Fontana, which suggests that it was overlooked in FE. The version without an accent could be however considered equal due to the dynamics of this bar, which was not specified – after the 7-bar cresc., 
seems natural; in this situation, a dynamic accent is actually superfluous, as the next bar begins in 
dynamics. Nevertheless, even then this accent could be regarded as a typical mazurka feature, which is related to adequate, dance rubato (delay of the 3rd beat of the bar). Taking into account the above, in the main text we suggest a variant solution, leaving the choice of adequate dynamic relations (and perhaps agogic) in this bar to the performer.
There is a similar situation in analogous bar 56 and in bar 32 as well.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Errors in FE
notation: Articulation, Accents, Hairpins