GeoJSON renders incorrectly with default Rhumb arc type

I'm using Cesium 1.60.0 and trying to load GeoJSON describing borders of Russia. I extracted this GeoJSON from shape files found on [NaturalEarth](http://www.naturalearthdata.com/downloads/) (1:50m resolution, cultural). Unfortunately, Cesium does something wrong while rendering the GeoJSON. Seems like it draws polygon lines between points that should not be connected with each other.

I report this issue because this GeoJSON is displayed as expected with another software such as QGIS.

[Sandcastle example](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/#c=ZZBLa8MwEIT/ivHFDhTJr8R264RCCoVS6CHQky9raZ2ola2gR0Ly6ysnbeljb7vzzTLMAXRwEHhEHSyDEY/BGo1wA3m93OKIXda1Gi2IEXU0u2vHK084WNgopz1CgPP40/mI6smo8eFbJVIBj6OdtXtzS+lWGEu2wu5c5wxq5l/jaAlTA8XzGWldQVn2i4RBV/GsWKR5XxTJvK47ZJjDnGo40hpYUXgy7ROe9zmrkrLOoPRytiizPmVVUfZFzql2xgggbz5RNJvChzdhY+xJ4qodAz/3YtgrbQOnZUwItTjsJVg0tHPsHX0uYyZbQ79MDReHQPBlG/7ppg0DJsEYr/ROyo04YxuuGur5X7apDjFuXw6oJZwmZJeunq9HQkhD/frfZZWSHegfHz8A)

```javascript
var viewer = new Cesium.Viewer('cesiumContainer');
viewer.dataSources.add(Cesium.GeoJsonDataSource.load('https://gist.githubusercontent.com/ezze/98a77f60cab8d24613f440599bece3a5/raw/9ac4498a1f0d3f3c80792a73a52672f1c847f43d/russia.json'));
```


*Cesium doesn't display GeoJSON properly*


*QGIS displays GeoJSON as expected*


*[geojson.io](http://geojson.io) displays GeoJSON as expected*


*[mapshaper.org](https://mapshaper.org) displays GeoJSON as expected*

Browser: Chromium Version 75.0.3770.142 (Official Build) Built on Ubuntu , running on Ubuntu 18.04 (64-bit)

Operating System: Kubuntu 18.04

Start with the linked Sandcastle example and reproduce the issue using GeoJsonDataSource.load with the provided Russia GeoJSON. Trace the default Rhumb arc rendering and compare it with QGIS, geojson.io, and mapshaper; done means the borders render without spurious polygon connections.

Written by the indexing model from the issue text.