He was on a previous version and the bug on the Corvette seems to be corrected. S397 has probably apply a solution or know the problem.
I'm a developer, and it happens that we need to correct errors by doing guess and trials.
Some critical issues not reproductible have no other ways of finding a solution but you can't let them as is. And most of them get a solution or a workaround at least ...
At this point, i will try another SC or just get back to the default, which is sad. I love this SC, but i also can't keep these random squares appearing on streams which are very annoying. Most of players won't see the issue ... not mentionning a big part of them doesn't care about a bad Safety Car they never see or appreciate.
Here, the workaround is to not use lights, which is sad, again or maybe use lights always on.