How to get cross-staff beaming? Should be automatic; it's not. Why?

[Kenneth Wolcott]

Hi;

  Making progress on the \change Staff Lilypond feature now.

  However, the current incarnation of my Swan Lake harp part (one bar
so far), does not have a complete beam (only each triplet has a beam).
I thought that this would be automatic.

  Please see attachments.

Thanks,
Ken Wolcott

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Swan_Lake.ly
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Swan_Lake.pdf
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