Grass is also very flickery for me. I wasn't sure if it was something on my end or caused by the update, since I happen to be running on a freshly reinstalled Windows, so it's the first time I log with this fresh install and Monday's patch installed.
I'm using a Radeon RX 470, with also a new AMD video driver release (17.2.1).
Someone mentioned in another thread somewhere that it is the 17.2.1 update that causes the flicker. They had reverted back to the previous driver to that one, and the grass flicker had stopped.
Hmm haven't seen that . Have you updated your graphics drivers ?
Sometimes having updated the drivers is what causes the problems. I distinctly remember AMD having driver issues on the AMD R9 295x2. That was why I went for the GTX980 instead.
nVidia is far from perfect too. They release buggy video drivers at times and don't even get me started on their shield tablet... (which I happen to be writing this on right now).