Snow graphics glitch after save and reload

I discovered recently while playing the MPD level Snow Hope that saving then reloading the game causes certain graphics glitches, namely that fortified walls created on rocky earth or sand, as well as Augrum Walls, will show up using the regular brown graphics. The same problem also occurs when locking a Glacial Door, but this is immediately after locking the door rather than after reloading a game.

System Specs:

OS: Windows 8.1 (64-bit)

RAM: 8GB

CPU: Intel Core i7-4770 @ 3.40GHz

GPU: AMD Radeon R9 200