The fact that the slur was overlooked both by the copyist and the engraver of FE could be explained by its shape and placement – the greater part of the slur is flat and is high above the text, closer to the bottom stave of b. 33-34 (it even intersects the 'p' letter in the pedalling markings) than the final chords in the Prelude. The fact that it is a slur is confirmed by its ending as well as by the slur over the crossed-out version of those bars.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in FE, Errors of FC
notation: Slurs