Slurs ignore intermediary cross-staff notes

[Valentin Villenave]

Greetings Bug Squad,

I've been looking at the tracker and known issues, but I couldn't find
this one. Is this considered normal behavior?

\version "2.15.3"
<<
  \new Staff = "up" { s1 }
  \new Staff = "down"
    \relative c' {
      c8( \change Staff = "up"
      c' c \change Staff = "down"
      c,) c2
    }
>>

Cheers,
Valentin.

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