[XeTeX] irregular spaces between lines in Tibetan

[Yves Codet]

Hello.

If I compile the attached file I get an irregular spacing of lines, as you can see on the PDF: the space between the first and the second line is smaller than between the other lines. But if I replace:
	\newfontfamily\tibetanfont[Script=Tibetan,Scale=3]{Tibetan Machine Uni}
with:
	\newfontfamily\tibetanfont[Script=Tibetan]{Tibetan Machine Uni}
the spacing becomes regular. Is there an option I should add to the \tibetanfont command to get correct spaces with magnified glyphs?

Best wishes,

Yves

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