Same as in analogous bar 16, in FEcor Chopin changed the crotchets in the L.H. to quavers separated with rests. The crotchets, being undoubtedly the original version, also appear in CLI (with erroneously written semiquaver flags next to the 2nd crotchet) and Ap.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Accompaniment changes, Authentic corrections of FE, Errors of CLI
notation: Rhythm