Cartopy facecolor='' not working as intended only for certain projections

Question

I am using Cartopy 0.23.0 on a Windows 11 OS installed via conda-forge, Xarray version 2023.6.0, matplotlib version 3.8.4, and Python 3.9.19 . I am seeing strange behavior that I cannot figure out where setting facecolor='grey' only works for some projections and also only works for Robinson projection IF I specific the central longitude. Please see the attached screenshots. When it is not working it appears that it just fills the land facecolor values with the color for the max in the colorbar.

Code for Mollweide projection Mollweide projection land plotting in yellow instead of grey Code for Robinson projection with central longitude specified Robinson projection working as intended with grey values over land

Any help would be welcome!!

In both instances noted above, I am running the same code, just changing the projections and getting different facecolors in the plot that is returned. This problem also exists if change from specifying the central_longitude in the subplot_kws to not specifying a central_longitude.