There is a problem with setting showBackground to true for label

[PFeiJia]

What happened?

The Label property show defaults to false and showBackground defaults to true. Adding labels with LabelCollection and setting the Label's show to true should display the Label background, but it doesn't

Reproduction steps

const viewer = new Cesium.Viewer("cesiumContainer");

const labels = viewer.scene.primitives.add(new Cesium.LabelCollection());

const label = labels.add({
  show:false,
  showBackground: true,
  position : new Cesium.Cartesian3(1.0, 2.0, 3000000.0),
  text : 'label showBackground',
});

setTimeout(()=>{
  label.show = true;
},1000);

Sandcastle example

No response

Environment

Browser: Google
CesiumJS Version: 1.122
Operating System:Windows 11

[brysonbw]

Here’s a Sandcastle example to demonstrate the issue, so others can quickly reproduce:
#12390 Sandcastle Reproduction

[jjspace]

Can confirm the issue happening

I looked into it briefly and discovered that when a label is first created and it's hidden we do not create an internal "background billboard" for it. Later when the show property is updated it tries to update the backgroundBillboard.show but it was never created so that does nothing. This could be fixed at a handful of places in the update/creation process but someone will have to think through it a bit more

[Beilinson]

Same issue as reported in #12138, tested locally and is fixed by #12922