Well... there is another bug about that, when your grindind in your home, with a mount, and your playing on pc, the grass wont respawn again, so you cant farm, i noticed that if someone cut the grass on the spot where you cut (and it dont respawn again) it will grow again
More simplified; If you cut the grass on your home in pc with a mount, it wont spawn more for you, and only will spawn if other cut the grass on you cant cut them
Another similar bug its when in a bushes spot, it shuld be one, but it doesnt, like it doesnt loaded for you