Player:RequestStreamAroundAsync() doesn't work on terrains?

After doing the Player:RequestStreamAroundAsync() function, it only loads the parts near the CFrame and not the terrain for some reason. I don’t know if this is a bug or I’m doing it wrongly or there’s an explaination for this. Also I can’t post Engine Bugs so I posted it here.

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P.S. that is a fictional name (character name).