This method has a check that is meant to stop certus from dropping when the block its attached to is broken, but it also inadvertently makes it impossible to harvest with a Create mechanical drill, or any other block breaker that doesn't rely on fake players (create's deployer w/ a pickaxe works fine, for example). maybe you could check if the block is attached to anything instead of if its being mined by a player, that way players could make much more creative and unique farms using other mods.