Just OLCIed for MH3225, its a Labuan-Miri flight operated by Maswings ATR. The booking was a standalone one, only for this sector. After I entered my RJ Emerald number, the system showed that I am entitled to 40KG of baggage rather than the original 20KG and displayed the status on the boarding pass.
I don't think I will need that much baggage and there does not seem to be a lounge in Labuan, but I will try to ask the staff at the check in counter for details in 2 days.