Seems like instanced or h.instanced static mesh render twice. Material is flickering between two states, you cant see it if u are just using instanced static mesh, but you can see it if you trying to custumize it by RandomPerInstance
Steps:
- Create empty project
- Create actor blueprint, add instanced static mesh, set mesh to shape_plane
- Create material with nodes RandomPerInstance->DebugScalarValue->BasicColor
- Assign material
- Add blueprint to scene, add some instances(10 for example) and move it from each other so they all be far from each other.
- RandomPerInstance has unique float for every instance, so every instance will have own value displayed on it by DebugScalarValue. But if u fly around u will see flickering or material/mesh with DIFFERENT values, like some meshes are rendered twice.
Here you can download project with that issue