"disableDepthTestDistance: Number.POSITIVE_INFINITY" give rise to disappear when drag to some place

when i use "disableDepthTestDistance: Number.POSITIVE_INFINITY" in a new entity just like this

`
viewer.entities.add({
position: Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
billboard: {
image: "../images/Cesium_Logo_overlay.png",
disableDepthTestDistance: Number.POSITIVE_INFINITY
},
});
`

Then I drag earth and found that billboard twinkled in some place. Then I drag slowly and finally found a place near here that the billboard disappear!

Start with the reproduction in the issue using a billboard with disableDepthTestDistance set to Number.POSITIVE_INFINITY, then drag the globe through the reported area and observe the flickering and disappearance. Trace the billboard rendering and depth-test behavior responsible for that result; done means the billboard remains visible and stable while dragging through the affected location.

Written by the indexing model from the issue text.