MH checks in no problem to all one world connecting flights even if on separate tickets, in fact I had a flight recently from Kuching to KL then CMB to Muscat with UL (separate tickets) and the layover in KL was 20 Hours my bag was still interlined from Kuching and arrived muscat, from what I understand the baggage in any connection over12 hours cannot be interlined but the agent was friendly and no questions asked.