We interpret the notation of A as incomplete or perhaps erroneous. Chopin wrote a 
only in the 1st half of the bar, on which the end of the line falls in A; perhaps he was convinced that the bar had already ended or simply forgot to write the ending of the mark in a new line. Anyways, the shape of the figurations in this bar suggests that the crescendo should be continued in the 2nd half of the bar and to the very end, since the topmost note falls only just on the beginning of the next bar (unlike in the previous two). Due to the above, in the main text we model the beginning of the mark after previous analogous bars; as far as the ending is concerned, we lead it to the end of the bar.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Scope of dynamic hairpins, FE revisions, Inaccuracies in A
notation: Articulation, Accents, Hairpins