[docs] <CodeSandbox /> previews for THREE.js related projects are broken

[sxxov]

From what I can tell, this affects both react-three/fiber & postprocessing, but I can't find any repo for the docs site itself. The links themselves load, just the previews show "Error creating WebGL context."

Repro

Navigate to one of these pages:

https://docs.pmnd.rs/react-three-fiber/getting-started/your-first-scene

https://docs.pmnd.rs/react-three-fiber/tutorials/testing

Error