I think it’s something also to do with Terrain, I’ve had this issue before with no resolution.
What’s it look like from a Player’s perspective, would they even notice? I say this because I think part of the issue is looking top-down at Decals/Textures when there is Terrain underneath, so hopefully wouldn’t affect the players POV that much (unless the trunks and branches are clear as day too).
Do you have any additions to Lighting that could be affecting it in a higher graphic setting, such as Sun Rays/Blur/etc.?