Like the title says, any landscape changes or objects I move around from vanilla don't appear in the game. Actually, not entirely true, there are some changes that stick(like changing cells and loading doors, for example), but landscape in particular doesn't. What do I need to do for the changes to appear?
EDIT: Seems it has to do with whether the changes are in an esm or esp, with the latter representing the changes accurately. So I will modify my question: why do the changes manifest through an esp and not an esm?