In PE there is no arpeggio before this chord, which in this context is certainly an oversight. In JC, both signs of arpeggio in this bar are placed after chords. It seems to be one of the numerous graphic slips committed by the copyist (it also concerns bar 50, which is not written out in JC).
Compare the passage in the sources »
category imprint: Differences between sources; Source & stylistic information
issues: Errors in PE, Inaccuracies in JC
notation: Ornaments