HLSL Texture2DSampleGrad a Virtual Texture not possible?

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I’m currently trying to sample a virtual texture, but throws
(Node Custom) Bad type TextureVirtual for Custom input Texture

Anyone know if it’s possible, I’m not quite sure what would be the replacement.

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In our case, we got this error message when switching to higher-resolution textures. The core problem was that the new textures were jpg rather than png so the alpha channel was missing. Once we converted to png with alpha it worked again.