Found a video of it on youtube:
https://www.youtube.com/watch?v=a6KOp5uHQO8
Wish it was more visible but you can see the foliage flashing white.
I had this issue. I recorded a clip directly from the Playstation and analyzed it in slow motion on my phone. The phasing from light to dark while turning my character was not apparent, suggesting it is a television issue. I disabled several options on my TV (noise reduction, smooth motion, adaptive lumina etc.) to no avail. What finally seemed to work was slightly reducing the sharpness. My TV runs at 60hz (no 4k, no hdr). I think things like the trees and grass in FC5 are detailed to the point where some TV's can slightly struggle to display them. Hope this helps.