In FE, the accent in bar 90 was overlooked, which is undoubtedly a mistake. The sign was added in EE, probably by analogy with identical bar 92. Same as in all subsequent, similar bars, EE has short accents (cf. notes in bars 98-103, 106-108 and 114-116).
Compare the passage in the sources »
category imprint: Differences between sources
issues: Long accents, EE revisions, Errors in FE
notation: Articulation, Accents, Hairpins