I can see that this is confusing, but it is expected at the moment, and I’m not sure of a good way to fix it. The physical material is stored on the collision body, so when you change the PhysicalMaterial on the MID, the body needs to be updated. Unfortunately we don’t have a mapping of all bodies using a particular MID, and updating all of them could be very expensive. The best workaround is probably to call SetMaterial again on the afftected component, which will update the collision info. Or you could manually query the material and then physical material on the object, rather than using info from the HitInfo.