I want to convert a world coordinate to the local coordinate of a RealityKit entity.
According to the docs, this should be possible using convert(position:from:), called on the entity.
Since it did not work as expected, I wrote a little test project. I used Apple’s template for a visionOS immersive app, and modified it slightly. This is my immersive view:

struct ImmersiveView: View {
    var body: some View {
        RealityView { content in
            var defaultMaterial = UnlitMaterial()
            defaultMaterial.color.tint = .brown
            let mesh = MeshResource.generateBox(size: 1)
            let boxEntity = ModelEntity(mesh: mesh, materials: [defaultMaterial])
            let anchorEntity = AnchorEntity(world: SIMD3<Float>(0, 0, -4))
            anchorEntity.addChild(boxEntity)
            content.add(anchorEntity)
            
            let coordinate = SIMD3<Float>(0.1, 0.2, 0.3)
            let coordinateFrom = boxEntity.convert(position: coordinate, from: nil)
            let coordinateTo = boxEntity.convert(position: coordinate, to: nil)
            print("coordinateFrom: (coordinateFrom)")
            print("coordinateTo: (coordinateTo)")
        }
    }
}

It contains a box visible in front of the main window. The box is not at the origin (z = -4).

Unexpectedly, coordinateFrom as well as coordinateTo are equal to coordinate. I expected that coordinateFrom is different, because the box is not at the origin.
What am I missing?