IndexOutOfBound crash in optimization api use

I am trying to use Optimization api - https://docs.mapbox.com/android/java/overview/optimization/

I am getting following crash in this :

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.get(ArrayList.java:437)
        at com.mapbox.services.android.navigation.ui.v5.route.MapRouteLine.buildWayPointFeatureFromLeg(MapRouteLine.java:359)
        at com.mapbox.services.android.navigation.ui.v5.route.MapRouteLine.buildWayPointFeatureCollectionFrom(MapRouteLine.java:351)
        at com.mapbox.services.android.navigation.ui.v5.route.MapRouteLine.drawWayPoints(MapRouteLine.java:345)
        at com.mapbox.services.android.navigation.ui.v5.route.MapRouteLine.access$300(MapRouteLine.java:45)
        at com.mapbox.services.android.navigation.ui.v5.route.MapRouteLine$1.onRouteFeaturesProcessed(MapRouteLine.java:331)
        at com.mapbox.services.android.navigation.ui.v5.route.FeatureProcessingTask$1.run(FeatureProcessingTask.java:65)
        at android.os.Handler.handleCallback(Handler.java:888)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:213)
        at android.app.ActivityThread.main(ActivityThread.java:8178)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)

Android API:
Mapbox Navigation SDK version: 0.42.6

Sample code : https://drive.google.com/file/d/1VZVjlSWWV2qEJ_WUaiJCCg5dT5aLSxMp/view?usp=sharing

Start with MapRouteLine.java around lines 345-359 in the stack trace, then trace the call from FeatureProcessingTask.java. Reproduce the crash using the linked optimization API sample with Navigation SDK 0.42.6. Done means the optimization route no longer throws IndexOutOfBoundsException while drawing waypoints.