ModItem Class

public class ModItem extends Item {
    public ModItem() {
        super(new Item.Properties().group(ItemGroup.TOOLS));
    }

    public ActionResultType itemInteractionForEntity(ItemStack stack, PlayerEntity playerIn, LivingEntity target, Hand hand) {
        if (!(target instanceof PlayerEntity)) {
            if (!playerIn.world.isRemote && target.isAlive()) {

                System.out.println("Mod cap before: " + target.getCapability(ModCap.MOD_CAP).orElse(new ModCapMethods()).get());
                target.getCapability(ModCap.MOD_CAP).ifPresent(IModCap::set);
                System.out.println("Mod cap after: " + target.getCapability(ModCap.MOD_CAP).orElse(new ModCapMethods()).get());

                stack.shrink(1);
            }

            return ActionResultType.func_233537_a_(playerIn.world.isRemote);
        } else {
            return ActionResultType.PASS;
        }
    }

}