Negatron on the Air Niugini engine replacement.
Not in the last 2 years anyway
Although, I do agree that a Beta Lockout device should be installed. At least it should stop an application aft of the flight idle gate, for whatever the reason.
Beta Lockout doesn't stop the power levers going below flight idle - just extends the protection envelope of the current "beta backup" system that stops the props going into beta above flight idle, to the below flight idle regime in flight as well.