Your level of detail algorithms would produce observable artifacts unless you have some super AI managing it aware of the meaning of things like electronics and sensors so it can simulate the few cubic centimeters of rock that's the processors in a space probe but won't bother simulating the millions of cubic meters of rock in the asteroid it's flying past. Also, it needs to know that this chunk of rock is part of a gravity wave detector so you need to sync it up with the simulated supernova that happened 30 years ago 30 light years away... but this is just a chunk of the Earth and you can treat it as a uniform mass of undifferentiated basalt.

I don't think it's possible to hide the error artifacts from even our level of technology.