In FE, the slurs that begin in bar 396 and 398 (and also 400) end on the 5th semiquaver of the following bar, in a place where a new slur also begins. In this context, it is to be considered an inaccuracy. Perhaps the engraver literally conveyed Chopin's bold, imprecise slurs, which are frequently encountered in his autographs. The revisers of GE and EE correctly ended those slurs on the 4th semiquavers of the discussed bars.
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category imprint: Differences between sources
issues: EE revisions, Inaccuracies in FE, GE revisions
notation: Slurs