Materials are swapped when restarting or playing the project

Hi, when I restart the project, or press play (simulate, other window, etc), some materials are swapping. A woodbeam will use the texture of a rock and things like that.
-Selecting the object makes it turn back to normal, in viewport or in simulate.
-It happens to nanite meshes, I haven’t seen it on regular meshes

If you encountered this, have an idea about what’s happening, or know how to fix it, I’m all ears!

This problem has been asked many times now, can we maybe pin it to the top?

Megascans object material issue - Development Discussion / Unreal Engine 5 Early Access - Unreal Engine Forums

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