When in stance adjust left or right while prone on a slope, you can encounter a number of glitches:

• Shooting the terrain when your gun does not appear to be obstructed by it (in first person)
• Seeing through the terrain to the water layer underneath
• Player model clipping through the terrain, torso not resting on the slope (like the legs do)

See screenshots attached. {F20830} {F20831} {F20832} {F20833} {F20834}