Not only bushes, they also see through thick clouds of smokes.
When they throw smoke grenades on us, it doesn't mean they want to get up close and personal with us. So don't fix your bayonets when that happen, just find cover, cause they'll shoot through the smokes.
It seems bots will see through any objects that is not 3D meshed (like tall grass, bushes, smokes, clouds, sandstorms, water, which is just texture effects)
