flying beam with crossing fingers

[Helge Kruse]

Hello,

I found a problem where the beam is not at the end of the stems but flying 
somewhere below them. The score excerpt is below.

There is also an very interesting output, if you remove the \stemDown. It 
looks as the stemDown doesn't make sense in the excerpt, but it does in the 
whole score.

Best Regards, Helge

test.ly
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