Weird tree texture in distance

[MichaMMA]

may be it’s like the “triangle” topics ? As example

Grass Triangles

Does anyone know why my grass textures are like this? Only if I turn them off do the triangles disappear. I’ve seen a workaround is a reinstall but wondered if I got new textures from elsewhere they would overwrite and I could avoid that. [Screenshot (1)] [Screenshot (2)]