When changing something connected to a CustomMaterial, or resizing the View3D that it is rendered in then the Model using the material will render as black

When changing something connected to a CustomMaterial, or resizing the View3D that it is rendered in then the Model using the material will render as black. In the attached example you can either resize the window, or change the start/end color and then it will be rendered black. If you change the texture size after this happens then it will update to be fine again.