The absence of 
in EE – unless it is the engraver's oversight – may mean that Chopin overlooked the base text to this edition, adding the hint in Stichvorlage manuscripts. It is also possible that he deleted the sign written before the 2nd beat of the bar, willing to move it to the beginning, yet he did not finish the correction (such a correction can be seen in GC, see also bar 29).
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: EE inaccuracies, Authentic corrections in GC
notation: Verbal indications