Does it matter which lot you load it to ?
Is it only this lot you're having issues with or all randomly downloaded from the gallery ? I assume from your description it's all but wanting to make sure.
Also, as asked above, if you don't involve the gallery, do you have issues with terrain paint not staying ?
I haven't tried with your pack combination yet but will do so after lunch.
EDIT: Still have no issues
Ok, what I found is that it seems to have to do with lotsize:
- if the placed lot is bigger then the used lot, terrain paints disappear
- if the placed lot is same or smaller, terrain paints are placed
Tried this now with a few different world lots and a few different gallery lots on them.
In the past, Sims 4 didn't have this behavior. I often build on a larger lot and then move to a smaller one. (having some extra space makes it easier to build)
