It’s quite prominent in the new Scandinavia update (WU5). The size of this update was small, they seem to use a low resolution LOD (again?), to display high resolution mountain details in some way. This causes mountains, or parts of mountains to change shape suddenly, or even suddenly pop up (change height drastically) so the issue remains, alas. Despite >300 good votes here.
I can add some information: it definitely improves when your terrain LOD is better. Tonight I compared the LOD distributed with the WU-5 with a public domain LOD for Norway, which is - I estimate - 2x better and 4x the size. More resolution helps with this issue. If you use a 20m Norway LOD, you keep seeing pyramids (mesh simplified to zero) on the far horizon, but the sudden height changes are less prominent, because max height, the horizon in view is more accurate, when the mesh is simplified on longer distance.