Trevenant & Dusknoir GX Attack Is Bugged

The GX attack for this Pokemon is bugged. It’s supposed to discard all of the energy of a Pokemon and knock it out on your opponent’s next turn, but it only discards the energy and doesn’t knock it out when you have an extra psychic energy.

Pale Moon GX
At the end of your opponent's next turn, the Defending Pokémon will be Knocked Out. If this Pokémon has at least 1 extra Psychic Energy attached to it (in addition to this attack's cost), discard all Energy from your opponent's Active Pokémon. 

(You can't use more than 1 GX attack in a game.)