Your scene contains a skydome mesh with a sky material but it does not cover that part of the screen. please tell me about this issue

I am using Unreal Engine 5.1
I am importing terrain into Unreal using Datasmith and one terrain is experiencing this.
How can I fix this phenomenon?

Your scene contains a skydome mesh with a sky material but it does not cover that part of the screen
When this message pops up

The static mesh and material are not connected to each other and the material is fixed at position 0,0,0

But if I connect the material of another Datasmith scene, it connects well
I would be grateful if you could tell me why