Nanite not working on merged meshes

Hi, I’m on UE5.5 (DirectX 12) and having issues merging static meshes.

I have a house with ~100 modular meshes.
As I want to later spawn many of them using PCG, I want them to be a single mesh and Nanite to work.

I’ve tried all these methods and then enabling Nanite on merged meshes, but none of them worked.

  1. Actor → Convert Actors To Static Mesh
  2. Actor → Merge Actors → Merge
  3. In Modeling Mode: XForm → Merge

Actually all of them also make the texture strange. (is it even related to this Nanite issue?)

What could be the solution here? Thanks.

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