Launching in Sport Mode Worse?

So today, with the encouragement of my 10 year old, we went to do a sport mode "sidestep the brake" type of launch and.... it just started accelerating after a short delay. It had never done that before. It was always an event.

Has anyone else noticed this? Perhaps a tweak during some update to protect the half shafts?

I never really did this very often at all, but it was fun the few times I had.