As in analogous bars 109-116, the slurs over the octave sequences are certainly supposed to reach the final crotchets. It was generally precisely marked in the sources except a minor inaccuracy due to the transition to a new line – in A and FE there is no ending of the slur from bar 276 in bar 277. It was corrected both in GE and EE.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: EE revisions, Inaccuracies in FE, GE revisions, Uncertain slur continuation, Inaccuracies in A
notation: Slurs