1. Open mission editor. start new mission on Tanoa.
2. Place player as soldier unit anywhere on the map.
3. Preview mission.
4. Pause mission.
5. In debug console execute:
player setPos [12759.6,7296.02,0.00154972]; player setDir 355.95;
6. Resume mission. Lower rifle.
7. Switch to 3rd person view
8. Move forward. Note player runs straight through the concrete.
9. Repeat from set 5, with rifle raised. Note player does not clip through the concrete as reliably. Presumably speed of movement influences bug.