The absence of 
in FE (→EE) could be Chopin's inadvertence (or the engraver's oversight). If this phrase (starting here) were to continue the previous dynamics (
from bar 49), the next mark in bar 65 would be only a confirmation thereof, while the whole would be devoid of a dynamic contrast, so typical of opus 30, and particularly of this Mazurka. On the other hand, the absence of indications does not mean that one cannot play in a varied manner; it simply leaves the choice of performance details to the performer (to a greater extent). Therefore, the version without may be considered an acceptable variant.
See also the next note.
Compare the passage in the sources»
category imprint: Differences between sources
issues:
notation: Verbal indications