Shadows have been severely downgrade and removed from foliage and grass since Patch 6, as well as all other shadows being much lower resolution than they used to be. "High" settings shadows now look the same as "low" settings shadows pre-patch 6. You can see the visibly missing shadows in this screenshot, as well as the shadows that are there being much lower resolution.

Working shadows:
[Linked Image from i.imgur.com]

Broken and missing shadows:
[Linked Image from i.imgur.com]