Not sure if this is a fix or a new change. They've been Ultimogeniture for at least the last 8 months, as indicated by this guide: http://www.reddit.com/r/CrusaderKings/comments/1yorfx/a_guide_to_the_khan_of_khans_achievement/
Now they're Gavelkind as of 2.2.0.8 (change not listed in 2.2.0.8 patch notes). In 2.2.0.5 or 2.2.0.6 they had the problem of succession switching from Ultimo to Open-Elective when Genghis died. In 2.2.0.6 or 2.2.0.7 they were fixed and back to Ultimo. In 2.2.0.8 somebody broke them again and made them Gavelkind. In 2.2.0.9, they are still Gavelkind.
Now they're Gavelkind as of 2.2.0.8 (change not listed in 2.2.0.8 patch notes). In 2.2.0.5 or 2.2.0.6 they had the problem of succession switching from Ultimo to Open-Elective when Genghis died. In 2.2.0.6 or 2.2.0.7 they were fixed and back to Ultimo. In 2.2.0.8 somebody broke them again and made them Gavelkind. In 2.2.0.9, they are still Gavelkind.
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