Tiles turn all black when shrunk to less than 5x5

We are trying to render geography at high resolution. I have been able to clip the area down, but when I shrink it to less than 5x5, the entire tileset turns black. Is this a bug or is there a way to resolve this issue?

If you’re using the built-in render pipeline, this is a known issue that is inherent to Unity that we can’t really fix.

But if you’re not using built-in, then how are you scaling the tileset? The Scale property on the CesiumGeoreference has higher precision than a Transform, so maybe that will produce better results.