Big powerful rear wheel drive van?
No weight in the back?
Wouldn't surprise me in the slightest if the TC kicked in.
Our LDV Convoy (that's a while ago...) would sit and spin it's wheels at the slightest hint of anything slippy unless it had a good load in the back. Once got stuck on the sill of a gate, a rail just a few inches wide.
More recently, the traction control on our works FWD Transit was a pain in the backside. It worked, in as much as it prevented wheelspin, effectively immobilising the vehicle as soon as there was snow on the ground. Fortunately, it had an off switch, or we'd never have got anywhere.
I once turned off the ASR/ESP/whatever it was called on a (also works) Peugeot 1007, just to see. I turned it back on pretty rapidly. It's incredible the basic chassis issues these modern systems can hide.
Give me a simple car with good chassis design any day.