Beaming, partcombine and pickups

[David F.]

I have a song in 9/8 time with a pickup of three eighth notes.  I expect 
Lilypond to beam those three eighth notes together, but it does not when I 
combine two voices with partcombine.

Am I doing something wrong?  Is Lilypond doing something wrong?  How might I 
work around this?

Thanks!
David

BeamsPartcombinePickup.ly
Description: Binary data

BeamsPartcombinePickup.pdf
Description: Adobe PDF document