In the image I have attached, you can see the seams between each tile. They are visible even as I zoom out.
What could be causing this issue and are there any fixes available? I do have a custom material that blends in when you get close to the terrain but the seams are visible even if I disable it.
I’m guessing you mean negative 116.689224? Those coordinates send me to a town center of some sort, whereas your screenshot doesn’t have any buildings. So it might be useful to be more precise about where you’re looking. But I can see a few cracks between tiles in that area. Unfortunately those are in the data, and not something we can fix on the Cesium for Unreal side (just to confirm, I checked the area in CesiumJS, too, and the cracks are in the same spots when using that client). If they’re causing you problems, you should report them to Google.