Destroying assets is not permitted to avoid data loss

I will follow this example( Add ability to exclude tiles by implementing a C# class. by kring · Pull Request #248 · CesiumGS/cesium-unity · GitHub )The following problem occurred during the operation

Hi @y_gg,

This is a known bug, and we have a Github issue open for it here. We’ll update this thread when we have a fix.

Is it a problem with the Unity version

No, it’s something wrong with the plugin attempting to destroy a texture asset in the cloned material.