I seem to have run in an error, where node materials would not compile on safari browser. It seems to throw an error related to gl_instanceID undeclared identifier (sorry I do not own a mac product and could not copy paste it). It seems to be related to this issue: ios - Use of undeclared identifier 'gl_InstanceID' - Stack Overflow
Are instances normally supported on OpenGLES2.0 / Safari by BabylonJS? If so, then I guess the new node materials might miss a fallback function? I guess it is related to the Instances Node Block.
I hope the issue is reproducable through this playground: Babylon.js Playground