Landscape mesh is bumpy at start of execution

Development World Creation
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1

UE5.1.1

Landscape mesh is bumpy at start of execution.
The mesh shape immediately returns to normal, but the shadow remains dirty.
How can I avoid this problem?

This level is “Open World” in Third Person Template.
The only difference is the placement of the Player Start actor.

2

Resolved.
I set Enable Nanite to True in the Landscape settings and this problem no longer occurs.