in 
The mark in A1 is clearly longer than the accents in the previous 3 bars as well as than the marks in b. 81-83. In spite of that, according to us, it is to be interpreted as a long accent, which is indicated by its unequivocal graphic relationship with the b minim. Marks of similar length are featured in A1 as long accents, e.g. in b. 6 or 26. The short accent in the editions is most probably an inaccuracy (and certainly in FE).
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Long accents, Inaccuracies in FE
notation: Articulation, Accents, Hairpins
