Cycles Glass: Transparent shadows? - Materials and Textures

I’ve been searching and searching for an answer to this, and I’ve seen renders such as this one (attached) that show the glass material allows light to travel through, but I’ve also seen posts and tutorials showing how to make transparent shadows for glass. So which is it? Andrew Price’s donut/cycles tutorial shows the shadow become transparent when he applies to glass shader but all I get is an opaque shadow, and no caustics of any kind. “No Caustics” is not checked in the Integrator and shado

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