Took around 9 days to credit MH flight to JL JMB.
Had some issues during check in when the staff told me my IC (domestic travel) and my JMB name were mismatched. Not sure what happens but they did manged to fixed it. I doubt MH will have access to other OW FFP database?
I booked my flight via MH webpage and inserting my JL card details in my booking.
*Too bad JL only recognized MH higher booking fare class (which is not cheap even for domestic flight).