We are trying to update our Cesium demos in house to the latest cesium version (1.21) and when we use the VR-TheWorld Terrain provider the elevation that is drawn has numerous discontinuities so it appears that mountains have stair steps. I have attached a picture of what I am talking about. This does not appear in our old demos which are accessing the same server and layers but were developed against a very old version of cesium. The strange part is that the terrain appears normal between the large discontinuities, and the discontinuities do not appear to be confined to tile boundaries.
Can you give me any pointers as to what is happening here? and maybe what I can do to fix it?