Landscape missing in the vieport, but once in play i apears back. (version 5.6.1)

Hey all! hopefully a quick question: the problem is, when i am looking on my landscape through the viewport, the landscape is missing. ( Though you can see it the water reflection) All th visibility is toggeled on for this image. For the next image i disabled it (As you can see the reflection has disappered). If i hit play, the landscape suddenly apears. The map is a world partition one, and all the rgions are also loaded. Any ideas of what this can be? (i will load the other images 1 by 1)

So, the fix was found. If you get the same problem (when every landscape disapears from any level within your project):

  1. Go into your console (~)
  2. Paste the following code:
    viewmode lit
    show all
    showflag.landscape 1
    showflag.geometry 1
    showflag.staticmeshes 1
    showflag.levelgeometry 1