I've had two cars have blocked fuel lines due to different types of contaminant in the fuel tanks, in both cases the engines ran as normal, until they didn't and stopped. Although it's interesting that it would block both/two engines at the same time. That said, I also know of a double engine failure that involved two oil pumps failing within 20 minutes of each other.
Apart from the obvious lack of fuel causing this, I can think also they possibly put AVTUR in it by mistake. Not having an engine feathered is interesting as well, a twin will glide a lot further with both feathered, some better than big singles with short wings.