Same issue for me. Snow also won't stick to home lot, in conjunction with the static hair and block eyelashes. Seems to be an underlying graphics issue in 64bit that desperately needs a patch. It's now Feb '21 and the first reports were in October '20 so they really need to work on this. Do they read these forums? Can we...call them?
I am also having this issue, I built a house in edit town for my family to move into and when I put the terrain paint down it didn’t appear except for in the one spot I painted it last. What I’ve noticed is that when I left build/buy back to edit town and then went back into the lot the terrain paint appeared. You just kind of have to guess where you want them and how they apply for you to have terrain paints.
Hope this helps!
