@ Hmm im wondering if what you’re seeing is simply not the difference in shadow in tessellation handling between dynamic rendering code path and the static code path.
i.e in Editor if the landscape is selected you will see it rendered in dynamic code path, otherwise by default it’s static.
Can you try to use console command without having the landscape selected in the editor, and see if it change something(i.e if you see the same issue then when selecting the landscape)?
Landscape.Static 0 ← Disable static rendering
Landscape.Static 1 ← Enable static rendering
If you don’t know to enter console command while in the Editor simply open the Output Window, then at the bottom of this window you can type console command there.
Let me know if it change something! 