Heightmap terrain problem

so i keep getting bugs whenever import my heigtmaps, these weird black shading things appear they only disappear when you get close to them and then when you go back they reappear, i tried painting the same material over them and it fixes it so i was wondering if theres a way to fix this?

Are they hollow or made of a different Material just underneath the sand?
Typically Roblox rendering makes Terrain less detailed as you get farther away, so bleeding of different materials becomes more obvious.

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oh wait it makes sense, theres rock material under it cause roblox makes heightmaps have stuff under the surface

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