Fuel cut just doesn't come in

[soldave]

For the first time since getting this once non-working S5 Tii FC I got it onto the roads and finally got it into boost. Have a very old HKS EVC boost controller and set it up to use normal stock boost. Put my foot down and watched my boost gauge (aftermarket, not the stock one). Quickly headed up and hit over 9psi before I got off the gas. Was expecting the fuel cut or boost controller to come in but it just didn't.

Now the boost controlling problem is a separate issue, and could be down to a duff controller or a sticking actuator or something. But I was really surprised the much talked about fuel cut didn't hit. I don't have a visible FCD in my engine bay or anywhere else, so I was wondering if it's possible the previous owner has ghetto-rigged something by cutting a wire. Very curious as to how the boost was going so high without a cut coming in. If it doesn't fuel cut then that's potentially great, but I'd really like to know why.