I made the car. The taillight utilizes the lighting used by the dashlight. It’s just that its a very big and long light, so I assume that’s what’s causing the blur.
it’s such a weird issue, I’ve never heard anyone say anything about it.
To correct the reverse lights and your brake lights, you should use a visual settings like RadianceV or MVG or something similar that makes your lights brighter.
It will ‘blur’ the taillight, but it will produce a better result around the whole vehicle and all of your in-game vehicles.
I will do some testing with other lighting methods.
check for an update within the next few days