Slurs encompassing a group of notes, the first of which is provided with a staccato sign, are not uncommon in Chopin's works. However, such situations appear most often in accompaniments performed by the LH – see e.g. bars 157-162 – in which the staccato signs emphasize the bass line*. In the discussed place, there is no reason for using such an unobvious combination of markings, so we consider the dot under the a1 quaver to be an error. See also b. 123.
* In the Ballade in F minor, op. 52, this type of combination of staccato and slur in the melodic voice appears in the autograph in bars 11, 15 and analog. However, sources based on other, lost autographs have different markings.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Inaccuracies in FE, GE revisions
notation: Articulation, Accents, Hairpins