granularity in polylineVolume sometimes doesnot work

I drew a satellite ortbit as a polylineVolume, but obtained what I didnt expected.

Following is a sample code.
https://sandcastle.cesium.com/#c=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

In RedTube, two mid points are connected a streight line.
But from same coordinates, BlueTube are drawn by an expected arc.

In addition, when you modifies the coordinates data of a mid point, such as
```
new Cesium.Cartesian3(2564694, 6517685, 747164),
```

streight line behavier will be vanished.
(It is closed to what I expect)

Start by running the linked Sandcastle reproduction and inspect the polylineVolume granularity behavior for the red and blue tubes. Vary the supplied midpoint coordinates as described and compare the resulting straight segments with the expected arc; the issue is done when the reproduction consistently produces the expected arc.

Written by the indexing model from the issue text.