My standard UK ST205 only experienced fuel cut once and that was on a warm Goodwood track day. This was in the days before I had modified it in any way so didn't have a boost gauge. When I fitted a Greddy electronic boost gauge at a later date I could see the standard car was boosting to 1.2bar.
I subsequently discovered that this level of boost was higher than normal for an ST205 which I recall is set at 0.9bar on the actuator. After I joined the OC in 2000 and started poking around the engine bay I then found that Toyota had fitted a bleed valve to the actuator line! The car had only one previous owner before I acquired it, a company director who bought it under a PCP so I don't think he would have changed something on a new car.
I suspect as this was one of the first batch of 100 UK spec ST205's that Toyota raised the boost so that the dealer and press demonstrator cars had more impressive performance. This was (is?) quite common practice in the industry. There's a contemporary road test of an Aussie spec ST205 which revealed that the car wasn't completely standard