It looks like KLM now have

AMS-KUL-CGK
AMS-SIN-DPS

Since they have 5th freedom rights on the 2nd leg of each flight, the economics on the route (if AMS-DPS is a low-demand market) might be such that a stop generates more revenue, since they can sell tickets AMS-SIN, SIN-DPS, and AMS-DPS instead of just AMS-DPS.

I'm not sure if there is necessarily a fuel savings on a non-stop. The fuel cost to fly the plane a km increases exponentially.