When I use CompoundCollisionShape, it causes onContactStarted to be called repeatedly about the collision

[SolarMoonQAQ]

it happens whenever the collision body undergoes a displacement transformation. And if I use another shape, like BoxCollisionShape, then it would be perfect to only have onContactStarted happen once on collision and not call it repeatedly.

[stephengold]

The physics engine uses contacts to simulate collision forces. A single overlap or collision can produce multiple contacts.

If you want to simply detect intersections of shapes, you might do better with a pair test or a sweep test.

For more information about managing collisions, see the tutorial page.