Landscape unload and bugged

Hi everyone!

I am writing today because Google and the forums could not help me. I made a very simple scene with a building and a landscape, but everytime I close the editor and open it again, the landscape is unloaded, and can’t be loaded. I also can’t delete it, The only thing that fixes it is to duplicate the whole level, and then it breaks the next time I oepn unreal. Is there any way to solve that? Losing the landscape every single time I clsoe the editor is obviously unnacceptable.
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