In A and FC3 the transition of bars 19-20 corresponds with the the transition of systems. In A the slur beginning on the last quaver in b. 7 extends beyond the end of the system, putting in question its actual ending, similarly in FC3.
With most probability this is why it is difficult to determine the actual ending of the slur in all first editions. In FE and IE the end of b. 19 also correspnds with the end of the system and here the slur ends on the last note of b. 19. In EE and GE bars 19-20 are in the middle of the system and here the slur was extended until the first note of b. 20. In the main text we present the second variant.
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category imprint: Differences between sources
issues: Inaccurate slurs in A
notation: Slurs