UE5: "Landscape Physical Material Needs to be Rebuilt"

Development World Creation
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Hello,
I am really desperate at this point.
I transferred my landscape from a 4.27 project to a 5.1 project.
Now, I keep getting this error that is described here.

PhysicalMaterialError

Solutions I have already tried:

  • Build Physical Material only

  • Convert to world partition and selected everything + Build All Landscapes

  • Added a new physics material (previously not set)

  • Resize to the same size

  • Set all textures in the Landscape material to shared:wrap

  • Completely removed the Landscape material (still getting the error)

However, the error only appears in “Standalone Game” mode.
Resizing the map to a larger size changed the error from 1024 to 256, but it didn’t go away completely.

Does anyone have any ideas or experienced the same problem?
Starting a new Landscape from scratch is not an option.

UPDATE:
I just created a complete new blank project in UE5.1.
Then i created a new blank level and inside a new landscape.
The error also occurs.
How is this possible?
Can someone reproduce it?

Greetings

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