the shadows cause strong flickering, on the ground, trees, bushes, walls and more. The visibility on the flickering varies depending on which setting you have on the shadow detail, but it is always there.
Here are two links to videos showing the problem
https://www.youtube.com/watch?v=zcHsQUypFa0
https://www.youtube.com/watch?v=V2jUVb-0_jg