In FEH, the ending of this bar was provided with two diagonal crosses, with which Chopin would often mark places discussed during lessons, most probably problematic. Moreover, there is an ambiguous entry between a
1 and d2; it can be interpreted as an inaccurately placed 
referring to a1 (see the adjacent note) or two additional notes, constituting an extended, variant version of the final ornamental figure together with the remaining demisemiquavers.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: Annotations in teaching copies, Authentic post-publication changes and variants, Annotations in FEH
notation: Pitch