Dimension - All applied materials change surfaces when replacing a material

Adobe Dimension - Version 4.1.4

I have a project with multiple materials applied to different surfaces of the model. When I attempt to try a new material for one of the existing surfaces - it applies the new material to a different surface and all the other surfaces swap their materials as well.

In the images - I am trying to change the base of the model, which is currently using the "Metal" material. When attempting to change it to "Alloy metal scratch" it applies to a different surface and then swaps all the other materials around to different surfaces.