High radius (>500) grass used to appear smoothly from a distance, now in 0.26 it pops up block by block. I tried tuning the values (including the console tip to increase gridSize) and resaving the terrain, no change. Groundcover maxElements are set slightly below "too many elements" console warning limits. Here the Max slope is set to 12 degrees, but hay still grows on a 45 degree slope. This setting broke in 0.25 and was already reported.
I've also noticed the road decals blur at a really short distance now. It's definitely changed for me anyway. Few things for them to iron out potentially