Lack of the grace note in EF is most probably a result of Fontana's error in preparation of the base text (copy of [AI]). The difference in the grace note's form – non-slashed in JC, slashed in PE – has no practical meaning in this context, as Chopin often did not pay attention to this detail. The sharp before the ornament is a patent error of the engraver of PE.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Errors in PE, Errors in Fontana's editions
notation: Ornaments