That now makes two Aus Caravans crashed, that I know of, that were practicing a glide approach whilst the propellor was in feather.
Have to ask the question, why do these glide approaches have to be practiced with a fully feathered propellor. Surely it makes more sense to set a power setting that gives a rate of descent/glide speed to that experienced with the prop feathered.
There would then be a useable power system should it all go pear shape.
Should be a message here for those in the Single Turbine Instructor/ check/training role.