UE4 and Substance Designer: Some parts of the texture from SD became black when not hit by light

I created a bricks texture from substance designer and imported the substance file in unreal engine. The texture bricks that I made is the bricks are being eaten by the ground behind it. The problem is that the ground that overlaps the bricks became black when not hit by the light. and if I move the point light in front of that black area then the brown showed up.In SD everything is fine, even if the ground that overlaps the bricks you can still see the brown even if its not hit by light.

Please refer to the screenshot to understand well my question. Thanks in Advance fellow devs!:slight_smile:

UE4: wihtout point light. You can see that the ground that overlaps the bricks is color black
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with point light.

Substance Designer

another screenshot in substance designer