I just tried the Monsoon mission into Changi. I spawned on the ground in some trees…
EDIT 1:
Attempt #2 I spawned in the air but the FMC was not working so I couldn’t tune the nav radio. I decided to continue and see what would happen…
It told me about 10 miles late that I was lined up and to turn in to the runway. I tracked back and lined up with the runway to descend but all of the following instructions made no sense. For example when I was 10ft off the runway I was told “we are off coarse to the right - correct left”.
I restarted to see if the FMC would work and started typing this message and although I have left MSFS on the “READY TO FLY” page all of the instructions and ATC comms are progressing even though I haven’t started yet…
EDIT 2:
I pressed ready to fly and I have started off at 35,000 ft and in a completely different situation to last time (autopilot is engaged but last time it wasn’t), and I started right over the runway rather than 20 miles out. I was just told to “set flaps 5” as if we are on approach 
EDIT3:
Started again and was in the correct state (altitude and position correct, and cockpit state correct). I was immediately told “we are off coarse to the right - correct left” so it seems to be confused again though. My FMC is still not on so I will have to do the approach manually again rather than following the ILS…
I manually lines myself up and descended. This time I broke out of the clouds at 1500ft and there was no rain so the approach was easy. Last time the visibility even on the runway was about 30 meters which made the approach almost impossible. This time the last 5 miles I did visually no problem and landed easily (100fpm landing according to Gees) which made the “Brace yourself” and the emergency vehicles being rolled out seem a bit silly. It seems like there is no consistency with the weather.
Also this time I got an approach clearance and hand off to tower which I didn’t get last time even though I don’t think I did anything different this time.