For a while (since the rollout of Future is Bright Phase 3), turning the EnvironmentSpecularScale setting to anything more than 0, parts with certain materials (e.g. Brick, Fabric, Metal) have red, green, or sometimes white highlights. This bug only occurs when a game has ShadowMap enabled and my Graphics Mode set to Metal.
Thanks for the images. Unfortunately I’m unable to reprouce the bug. Can you PM your latest log file after reproducing the bug? The log file location is mentioned here: Debugging | Documentation - Roblox Creator Hub