Did you confirm by checking both sides simultaneously do not spin at the rear? If not, it's simply the open differential doing its thing, which requires continuous, steady accelerator pedal application to let VDC use the brakes to transfer torque to the wheels with grip.
Another important question, CVT or manual transmission?
"Why would I want to profess my feelings for some 3D girl?" - Tomoya Aki from the anime Saekano