Lighting Bug on Parts with Slate Material?

When building in Roblox Studio it appears that parts set to slate material are covered in a black shadow that can not be removed. This is an issue as the part just looks black and from what I have seen, there is nothing I can do about it. Also I don’t know what could have possibly caused this. This started for me recently. Anyone else having this issue?
Here is an image if what it looks like:
Image1.PNG

Can you show the properties of the slate part?

That is all the properties except the Brickcolor, Cast shadow, and the Size. The Size and Brickcolor don’t change anything when I change them, and cast shadow is set to true. This issue also occurs when I create a brand new part and then change the material to slate.

Can you disable the CastShadow property?

Image1.PNG
This is all 4 parts with CastShadow disabled

Image2.PNG
This is an image of one of the parts when you get really close to it that. I don’t know if that helps though

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I’m literally having the same problem right now. A wedge that is brown became a black part.

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It must be some sort of bug. Whether it is or it isn’t I am unable to find a way to fix it unfortunately.