Cross-staff beaming in PianoStaff fails when combined with slur

[Neil Puttock]

Hello,

I'm getting some strange behaviour with cross-staff beams when they are
combine with a slur which stays on one staff:

\version "2.11.29"
\paper{ ragged-right=##t }
\score {
    \new PianoStaff <<
    \context Staff = rh \relative { c'8([ d) \change Staff = lh c,] }
    \context Staff = lh { s4. }
    >>
}

Kind regards,
Neil

bug.PNG
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