I think it has something to do with the fact that the grid parameters are created with linspace and meshgrid.
I tried loading in all of the parameters except the grids, but it just gave me an error that the grids were missing.
I tried something along the lines of this solution : How to load part of pre trained model? 3 but again it gave me the same error as the first, that the grids were the same dimensions but it couldn’t copy them.