In JC, the chords in the L.H. are written with g
1 instead of f
1.
In the same manuscript, one can see a number of cautionary accidentals, which somehow remind about their validity: a before e, e1 and e4, e3, a 
before a2 and a before f3. The flat before e1 on the 2nd quaver is also in PE.
Compare the passage in the sources »
category imprint: Differences between sources; Source & stylistic information
issues: Enharmonic corrections, Last key signature sign
notation: Pitch