World loading bug?(UE5-03)

So last time I closed my world, everything was fine. Now when I open it again, it looks like this (UE5-03):

There is just this huge area where the floor does not load anymore. I have painted three different landscape materials inside this area, but these are also to be seen on loaded places, so I do not think that is the problem.

I am a complete beginner, so I have no clue what kind of further information you need to help me. I would be glad if somebody could help me solve this.

EDIT: Of course, this type of thing only happens to you after posting on a forum. Found a YouTube video and solved it. For anyone interested: You select every Texture that is loaded in your landscape material and you change “Sampler Source” on the left hand side to “Shared: Wrap”