Please check the Cesium for Unreal version in the Edit->Plugins section of the Editor. The Epic Launcher just displays the UE version rather than the plugin version, for some reason.
Based on your video, I have two guesses:
- It’s depth fighting caused by two overlapping tilesets. How is your level set up?
- It’s a problem with Unreal’s “Dither Temporal AA” node. Perhaps an incompatibility with the M1, or perhaps you’re not using Temporal AA and so it’s causing artifacts instead (we’ve seen that in other contexts). If this is the problem, there are instructions for working around it here:
Forward rendering, MSAA, black squares and 'dithering' artifacts on terrain - #6 by Kevin_Ring