Known Limitation: PF Unit test subgrid hierarchy isn't filled out

For the PF unit tests of the Fortran code the subgrid structure is typically only filled out for the subgrid level of interest. For example for patch arrays only for patches. So it won't necessarily have proper mapping for gridcells. Landunits, and columns. Some unit tests populate more than one layer, but most do not populate all layers.

This can matter if you expect all layers to be populated. For example if you use the point option to endrun to write information on all layers.