I have the same problem, single player. I'm asked to flank to the left and take the high ground. game integrity verified. No mods, Keep restarting and it resolves comes back sporadically. Seems tied to using rifle and switching modes or reloading. Gun information area goes completely red when it happens. Similar to person above, can't change modes, gun, or search bodies when issue appears. Can still move. Death valley mission, campaign (survive).