The slurs in A in bars 21-30 are written in a quite precise manner. Without any doubt, it was the beginning and ending of the slur at the transition to the new great stave (after bar 21) that was most problematic for the engraver; they were interpreted as a single, long slur. FE and EE have two slurs here, which is most similar to A. In GE2 (→GE3→GE4) in bar 21 there are two slurs and a long slur from bar 22 matching A's slurring.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in GE
notation: Slurs