How do I get MeshResource.generateText() to anchor to something other than the camera using RealityKit and SwiftUI?

I'm using RealityKit and SwiftUI to place 3DText on iOS but I can't get the text to anchor to a position. I stripped the project down to the bare essentials below and it still doesn't work. The box will anchor and stay in one place as I walk around but the text will follow above my device wherever I move. This is driving me crazy because the box works totally as expected but the text just does not. I have tried so many different iterations of the code below to no avail. I was wondering if anyone else was having this problem or if it was just me, potentially a bug? Is there something else I should try?

import SwiftUI
import RealityKit

struct ContentView : View {
    var body: some View {
        return ARViewContainer().edgesIgnoringSafeArea(.all)    
    }
}

struct ARViewContainer: UIViewRepresentable {
    
    func makeUIView(context: Context) -> ARView {
        
        let arView = ARView(frame: .zero)
    
        let anchor = AnchorEntity()
        anchor.position = simd_make_float3(0, -0.5, -1)
        let textEntity = ModelEntity(mesh: .generateText("Hello there", extrusionDepth: 0.4, font: .boldSystemFont(ofSize: 8), containerFrame: .zero, alignment: .center, lineBreakMode: .byWordWrapping))
        let boxEntity = ModelEntity(mesh: .generateBox(size: 0.2))
        anchor.addChild(textEntity)
        anchor.addChild(boxEntity)
        arView.scene.anchors.append(anchor)
        
        return arView
        
    }
    
    func updateUIView(_ uiView: ARView, context: Context) {}
    
}