Beams of grace notes collide with tie in staff size5 1

[Reinhold Kainhofer]

I have a staff with two voices (actually, two part-combinedvoices).

In the attached example, the beam of the grace in the second voice 
collides with the tie in the first voice, but only if I use staff size 
15. In any other staff size, no collision occurs.

Also, the stems of the grace notes are way too long.

Cheers,
Reinhold

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Reinhold Kainhofer, address@hidden, http://www.kainhofer.com
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * Edition Kainhofer, Music Publisher, http://www.edition-kainhofer.com

lilypond-grace-beam-collision.ly
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lilypond-grace-beam-collision.preview.pdf
Description: Adobe PDF document