Rocks lose Material when rendering

I am using the following Material for a landscape: MW Auto Material in Environments - UE Marketplace

The rocks keep losing material when i reload the scene or render.

When i render, the rocks are white: https://youtu.be/hvZ9rThJgAA?feature=shared

Is there maybe a button like “rebuild landscape” or “bake landscape” or something? How to deal with procedural rocks, how to edit them? Thanks in advance for your help :slight_smile:

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