Whoever imported the FH5 model into FM wasn’t qualified for this simple task.
The model is totally messed up. Inverted normals and invisible polygons clipping in the reflection …
This only affects the Forza Vista model (LOD0). Gameplay and Photomode models seem to be fine. (LOD1/2/ etc)
Gameplay model is fine:
EDIT:
The gameplay model actually has an issue with something clipping through the A pillar or a texturing issue:
