ac-html-desc cannot receive CallbackProperty position

[nadavpld]

Trying to simulate a flight path of a 3d model helicopter.

<ac-map>
	<ac-layer acFor="let plane of planes$" [context]="this" [store]="true">
		<ac-model-desc props="{
			position: plane.position,
			minimumPixelSize: 100,
			uri: '../assets/models/scene.gltf'
		  }">
		  </ac-model-desc>
		<ac-html-desc props="{position: plane.position, show: true}">
			<ng-template let-plane>
				<div style="color: white">callsign</div>
			</ng-template>
		</ac-html-desc>
	</ac-layer>
</ac-map>

First try was a success, showing the model and the html as follows :

		this.planes = [
			{
				id: '0',
				actionType: ActionType.ADD_UPDATE,
				entity: {
					position: new Cesium.Cartesian3.fromDegrees(33, 34)
				}
			},
			{
				id: '1',
				actionType: ActionType.ADD_UPDATE,
				entity: {
					position: new Cesium.Cartesian3.fromDegrees(33, 34)
				}
			}
		];
		this.planes$ = from(this.planes);

I have used a setInterval function which updated the position through a call for updateLayer

Thinking forward (displaying hundreds of planes), the updateLayer call is not scalable, I have tried using CallbackProperty as follows

		this.planes = [
			{
				id: '0',
				actionType: ActionType.ADD_UPDATE,
				entity: {
					position: new Cesium.CallbackProperty(this.getPosition_0.bind(this), false)
				}
			},
			{
				id: '1',
				actionType: ActionType.ADD_UPDATE,
				entity: {
					position: new Cesium.CallbackProperty(this.getPosition_1.bind(this), false)
				}
			}
		];
		this.planes$ = from(this.planes);

The models are moving smoothless, the html label (which later will include a more complex view) was not showing at all.

By changing <ac-html-desc props="{position: plane.position, show: true}"> to <ac-html-desc props="{position: plane.position.getValue(), show: true}"> I got it to show, but obviously it is not updating and the label stays behind