When I create a landscape, normals are attached to the south and east corners (edges) without permission. how can i turn them off?

When creating a landscape with UE5, normals are attached to the south and east corners (edges) without permission
I am very troubled by this.
I am creating a very large open map and when I open all maps at once
Sometimes the system crashes, and it is not possible to open all maps at once.
I can’t do it, but if I load the map partially and work on shaping the terrain,
The same normal edge occurs in the loaded unit map
It is not possible to create natural terrain without normal edges.
In UE4, there was no such problem, and I was able to create a map that was equal to or larger than
From UE5.00 to UE5.20, this problem has occurred, and the method to solve it is
I do not understand.

Anyone know how to resolve this issue?
I would appreciate it if you could give me some hints.

I can confirm that this is an issue. No idea how to resolve, I tried using world-aligned materials but this seems to be an immutable part of the world normal that gets generated at landscape creation.

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Thank you for confirming the issue. I’m very happy to share the issue as no one has pointed out the same issue before.
I would like to report it as a bug and wait for improvement. thank you very much.

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