Lack of the slurs including each of the irregular semiquaver groups seems to be an error of JC. Generally, Chopin would provide such groups with a slur, most often together with a number determining the type of the group. Such slurs are most probably seen in FEF, while in GEF they have a form of ties sustaining the g1 crotchets. Also PE has here slurs which are a part of marking of irregular groups; however, due to the fact that Chopin additionally included the entire semiquaver figure under one slur, we omit the slurs in the main text (cf. General Editorial Principles, p. 16).
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Triplet slurs, Errors of JC
notation: Slurs