The accent entered into A is slightly longer than the previous ones (see the note on bars 341-346), hence we interpret it as a long accent. The absence of the mark in the editions probably resulted from an oversight by the engraver of GE.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Long accents, Errors in GE, Inaccuracies in A
notation: Articulation, Accents, Hairpins