The longer slur of FE may result from Chopin's proofreading, which is indicated by its absence in EE. Even if this was the case, according to us, it does not have to mean that Chopin wanted to change the concordant slurring of AF and GE, since the composer could have encompassed with a slur the entire phrase without noticing the slur in b. 147, which was moved under the stave in FE (it also cannot be ruled out that the engraver of FE misinterpreted this detail in the Chopinesque proof entry).
The missing slurs in AI are most probably an oversight – see b. 141-143.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Authentic corrections of FE
notation: Slurs