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Source:
p. 1, b. 1-39
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In A this bar opens a new line, while the 
mark begins still before the accolade, which suggests that it should start earlier, e.g. in the previous bar. Therefore, it is almost certain that considering it an extension of the hairpin from the preceding bars, as it was performed both in FC (→GE) and FE (→EE), is right.
The slightly shorter mark in FC (→GE) is an inaccuracy of the copyist.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: Inaccuracies in FC, Hairpins denoting continuation
notation: Articulation, Accents, Hairpins
Missing markers on sources:
A, FC, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, GE3, EE1, EE2, EE1a