In JC, the highest note of the chord could be considered as the so-called Terzverschreibung if it was not for the 
raising f1 into f1 written only before the next chord. However, if we assume that JC copied the text of [AI] correctly, the compatible versions of EF and PE seem to confirm Fontana's access to an additional source of authentic versions, probably corrections of [AI], introduced already after JC had been written.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Terzverschreibung error, Errors of JC
notation: Pitch