We're gonna have to be a bit more creative than "The chest totally ignores you.", since that works for every single attack ever
It turns out berdrock breakers only break birds rather than chests. While scratching your head at this, the chest throws up deflection shields which are impervious to BEDrock breakers.All you get is cake, but the chest still has stuff in it.
Point berdrock breakers from every signle direction, each powered by HP turbines.