Sandboxing is about preventing code from accessing data it's not supposed to. Data like files or memory belonging to other tabs or other processes. Or data streams like your webcam or microphone. Data outside of its, well, sandbox.
So how are compute shaders accessing data they're not supposed to? How do you think they're escaping the sandbox?
So how are compute shaders accessing data they're not supposed to? How do you think they're escaping the sandbox?