Duke3D/Polymer: Opening the Load/Save Game menu clobbers tile 0
Opening the save menus does something that causes tiling for tile 0 to fail. All other tiles appear to be unaffected.
A minor issue by itself because tile 0 is likely not used in maps anyways, but maybe it is indicative of a more serious problem.
Interestingly, you can still see a single tile instance of the texture render properly.
Edit: I forgot to mention that this only happens in the Polymer renderer.