The version of GE could have resulted from a double interpretation of the mark resembling a vertical curved line (with which Chopin most probably marked the arpeggio in [A]). Engravers would often work in stages, i.e. an entire page of noteheads, then beams, slurs, ornaments, etc., hence it is likely that the slur was engraved at the stage of slurs, while the arpeggio at the stage of ornaments.
The missing slur in EE must be an oversight of the engraver.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Inaccuracies in GE, Errors in EE, Arpeggio – vertical slur
notation: Slurs