Entity disappears when changing position

I have some strange behavior in my app. When I set the position to .zero you can see the sphere normally. But when I change it to any number it doesn't matter which and how small. The Sphere isn't visible or in the view.

The RealityView

import SwiftUI
import RealityKit
import RealityKitContent

struct TheSphereOfDoomRV: View {

    @StateObject var viewModel: SphereViewModel = SphereViewModel()

    let sphere = SphereEntity(radius: 0.25, materials: [SimpleMaterial(color: .red, isMetallic: true)], name: "TheSphere")

    var body: some View {
        RealityView { content, attachments in




            content.add(sphere)


        } update: { content, attachments in

            sphere.scale = SIMD3<Float>(x: viewModel.scale, y: viewModel.scale, z: viewModel.scale)




        } attachments: {
            VStack {
                Text("The Sphere of Doom is one of the most powerful Objects. You can interact with him in every way you can imagine ").multilineTextAlignment(.center)
                Button {

                } label: {
                    Text("Play Video!")
                }
            }.tag("description")
        }.modifier(GestureModifier()).environmentObject(viewModel)
        





    }
}

SphereEntity:

import Foundation
import RealityKit
import RealityKitContent

class SphereEntity: Entity {

    private let sphere: ModelEntity

    @MainActor
    required init() {
        sphere = ModelEntity()
        super.init()
    }

    init(radius: Float, materials: [Material], name: String) {
        sphere = ModelEntity(mesh: .generateSphere(radius: radius), materials: materials)

        sphere.generateCollisionShapes(recursive: false)
        sphere.components.set(InputTargetComponent())
        sphere.components.set(HoverEffectComponent())
        sphere.components.set(CollisionComponent(shapes: [.generateSphere(radius: radius)]))
        sphere.name = name

        super.init()

        self.addChild(sphere)
        self.position = .zero // .init(x: Float, y: Float, z: Float) and [Float, Float, Float] doesn't work ...

    }

   

}