STEPS TO REPRODUCE
I have attached three missions which consistently reproduce the issues shown in the video on Regular difficulty settings on my computer.
AITest-TeamSpotting: shows how an AI that cannot see the enemy, but whose teammate (unarmed) can see the enemy, will predictively engage a moving target with high accuracy *through* solid branches and foliage with no visibility.
AITest-TeamSpotting: shows that the issue is not the foliage ViewLOD. The AI has no view of the enemy until his teammate turns around -- then he gets perfect knowledge and shoots through the brush.
AITest-ProneThroughBush: The AI will see an enemy move for a moment before his view is blocked by the bush in front of them. He will then go prone and shoot the enemy through the bush (lethally) with absolutely no line of sight to the moving target.