With the latest patch the race tires don't grip anything

I have been using the ellisbury update since the public beta came out, and when these tires were added I tested them on different vehicles, having exceptional performance. However, with the latest patch, it feels like the car is on ice, as it easily oversteers and even in cars with a weight distribution of >60/<40 or even in cars where understeer has been forced. , with narrow front tires and excessive downforce.

And with these cars I can confirm that with the usual semislicks, “they don’t turn at all” under the same conditions.

As a reference, I have used cars with 50/50 all-wheel drive, boxer-6 and V10 engines in a central longitudinal position, with ~600KW/800CV and between ~1000KG.