UV distortion on SubUV particles gets ignored

I have a fire material that uses a texture sheet to play a fire animation. I’ve tried plugging in a panning noise into the Particle SubUV “UV” slot in order to give some extra movement to the texture. However, it seems the UV input is ignored - No distortion occurs on the texture at all. Is this a bug or is there a setting somewhere I need to check in order to make it work?