The Shader Graph of Canvas type does not work in the Polysptial RK mode

I’m using Unity 6.1.3f1 and visionOS 26 beta-3.

No error when using P2D on visionOS 26 b3.

Yes; we currently only support the Lit/Unlit/Sprite Unlit material types. I can make a note to treat Canvas materials the same way we treat Unlit ones. Until then, you will have to use one of the supported material types.