[WebGPU] Opening https://www.babylonjs.com/demos/webgpu/forestwebgpu results in a compilation error

Repro:
(1) Open https://www.babylonjs.com/demos/webgpu/forestwebgpu

(2) Grep for 'MSL compilation error'

MSL compilation error: Error Domain=MTLLibraryErrorDomain Code=3 "program_source:71:37: error: use of undeclared identifier '__ArgumentBuffer_1'
    const constant type0& global2 = __ArgumentBuffer_1.global2;
                                    ^
program_source:72:37: error: use of undeclared identifier '__ArgumentBuffer_1'
    const constant type1& global3 = __ArgumentBuffer_1.global3;
                                    ^
" UserInfo={NSLocalizedDescription=program_source:71:37: error: use of undeclared identifier '__ArgumentBuffer_1'
    const constant type0& global2 = __ArgumentBuffer_1.global2;
                                    ^
program_source:72:37: error: use of undeclared identifier '__ArgumentBuffer_1'
    const constant type1& global3 = __ArgumentBuffer_1.global3;
                                    ^
}