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So as the first screenshot below, I was playing around with probuilder. Then I found out that at the place where the arrow is pointing my player(cube) can land and interact with it normally, but would fall right through the place where i circled out.
So i tried using box collider to fix it, but adding box collider component to the weird shape turns the weird shape, well, a box (as the second screenshot). I was hoping that i could find answers wether its transforming the box collider into a werid shape collider, or simple pointing out where i might have done wrong with probuilder.
Also, I asked a question about terrain tool yesterday on 3D art session, but nobody answered. I think it is because its more of a code problem than it is a art problem since my console is displaying weird messages.