This is either an fbx translation issue or arnold for UE5 plugin for example,
but the goal is very simple, being able to see the arnold shader inside UE5 on import.
Many ways to solve this, but anything would be better.
Even some new node which would be able to switch from arnold shader and back.
Even if it's just one of arnold nodes, main aiSurfaceShader for example.
At the moment I can't find any good workflow for this.
Second is some automatic way to fix the transforms in the hierarchy, so that they can work inside UE5.