The accent visible in GC, if it reproduces the autograph notation faithfully, should be interpreted as a long one. EE has a short accent, which is probably an oversight, while FE and GE have none, which is probably a revision (cf. the note related to bar 377).
Compare the passage in the sources »
category imprint: Differences between sources
issues: Long accents, Errors in FE, GE revisions
notation: Articulation, Accents, Hairpins
