You have identified a glitch. Dunno if temporary or not.hope i didnt open another can of worms..couldnt get any availability in J for KUL/SIN/BKK to Australia.. in mid April.. only economy ..:-(
With TG availability only generally available 14 days out it's making it hard to get to/from Australia these days. There are some select flights in SQ business IIRC - if the flight is classified as 'regional' for seating purposes. 'De luxe' A380/77W on SQ may be problematic.
Connecting out of KUL may be difficult given LM doesn't always like connections.