Car: 1982 Porsche 911 (930)
Bug: Reverse light turns on when braking (picture 1) and when using reverse, reverse light lacks textured mesh (picture 2). Also, Rollcage mesh is present when installing street/sport chassis reinforcement (picture 3)
System: PC & Xbox (always reproducable)
Picture 1
Picture 2
Picture 3
Edit: added google images picture of a braking 911 for reference: