In GE2 the top voice is written in normal font notes. It is probably a mistake or perhaps an erroneous revision. GE3 restored the authentic notation using small quavers. Interestingly, normal font notation was initially also in A. However, Chopin quickly changed the concept and crossed out the R.H. part so written still before adding the L.H. part.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations; Source & stylistic information
issues: Corrections in A, Errors in GE, GE revisions, Deletions in A
notation: Shorthand & other