In JC, FEF, and PE, the 5th quaver f is not extended to the value of a crotchet. It is certainly a mistake (the notation's inaccuracy), as the necessity to extend stems from the presence of the tie sustaining this note to the minim f in bar 10. Moreover, in JC, the last quaver, f1, is written erroneously in a two-part form. FEF has a correct notation.
Compare the passage in the sources »
category imprint: Source & stylistic information
issues: Errors of JC, Errors in PE, Errors in Fontana's editions, Fontana's revisions
notation: Rhythm