Hi there, since Tanoa's release I noticed some quite jarring problems with grass LOD's due to the new system for phasing the LOD changes which only was a big problem on Tanoa for me and pretty much everyone else. E.g. the grass would change in very close proximity to you in a very noticeable manner.
Also happens on terrains such as Altis as can be seen in the video linked below: https://www.youtube.com/watch?v=OUI8c94eYNI
I believe this is not intended.
Video of issue: