It is only in EF that the lower voice on the 4th quaver of the bar is written correctly. In JC it does not appear at all (there are no quavers nor slurs), which is certainly an error due to writing the upper voice with the stems facing upwards. We do not complete this notation, as it is impossible to determine what was exactly missed by the copyist. In PE, lack of the quaver flag next to the f1-b1 fourth is an obvious mistake.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors of JC, Errors in PE
notation: Rhythm