Graphics bugs with diagonal FARHW ramps

[Varnado]

Hi,

In the last couple of weeks I've run into two graphics problems with the diagonal FARHW-6 and FARHW-4 ramps. You can see them both in the picture below: A four-square color pattern that appears at the join of the ramps at some angles, and a missing overhang texture to continue the outside lanes and shoulders on the diagonal. With the four-square colored box its appearance seems to be somewhat random, occasionally appearing on ramps that were built without issue upon the re-entry of their city tiles.

Is anybody familiar with these two graphical bugs, and perhaps a solution to them?