Opening 4.15 project in 4.16 - landscape black

I have everything set up pretty well in 4.15, but when I open the same project in 4.16 the landscape is completely black (no screenshot needed, it’s just a blue sky with clouds and a completely black terrain). I haven’t messed with anything, and the project looks fine in 4.15. I rebuilt the lighting but nothing changed. I haven’t got a clue what to do, any help would be wonderful!