Read literaly, the slur in A begins under the last note of the triplet. The notation in AI in that bar (= bar 9), and the script of the both autographs in the analogous bar 29 convince that this is an inaccuracy of notation due to the position of the accent on the 2nd beat. GE (→FE) already interpreted it that way repeating a longer slur from the analogous bar 29 (with similar imprecision, and also omitting a 'triplet' slur). EE shifted the beginning of the slur to under the grace note what certainly is mistaken.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Interpretations within context; Differences between sources
issues: Inaccurate slurs in A
notation: Slurs