Clustered labels do not reappear after clustering

[ollazarev]

Look, please, at this example: https://codepen.io/ollazarev/pen/rrQaee

After clustering, only the points appear again, but the labels after the clustering disappear forever.

After camera zoom, in addition to the points, the following cities should appear: Philadelphia, Canada, New York, Toronto.

A piece of code from this example:

let dataSource = new Cesium.CustomDataSource('dataSource');
dataSource.clustering = new Cesium.EntityCluster({
  pixelRange: 80,
  enabled: true,
  clusterBillboards: true,
  clusterLabels: true,
  clusterPoints: true,
});
let entity = new Cesium.Entity({
  position : Cesium.Cartesian3.fromDegrees(-75.1641667, 39.9522222),
  label: {
    text: 'Philadelphia',
    pixelOffset: new Cesium.Cartesian2(7, 0),
    horizontalOrigin: Cesium.HorizontalOrigin.LEFT
  },
  point: {
    pixelSize: 5,
  }
});
dataSource.entities.add(entity);
viewer.dataSources.add(dataSource);

[hpinkos]

Thanks @ollazarev, I was able to reproduce the bug

[hpinkos]

Actually @ollazarev, it looks like this is a duplicate issue of #6087. I'm going to close this one, but I'll add a link in that issue to this one so we can notify you when the bug is fixed. Thanks again for including the code example! That made this really easy to reproduce