Setting EJB's InjectionTarget does not work

@Singleton
public class Bus {

    private boolean initialized = false;

    public boolean isInitialized() {
        return initialized;
    }

    public void setInitialized(boolean initialized) {
        this.initialized = initialized;
    }
}

public class WrappingExtension implements Extension {

    public void wrapInjectionTarget(@Observes ProcessInjectionTarget<Bus> event)
    {
        final InjectionTarget<Bus> injectionTarget = event.getInjectionTarget();
        event.setInjectionTarget(new ForwardingInjectionTarget<Bus>() {

            @Override
            public void inject(Bus instance, CreationalContext<Bus> ctx) {
                super.inject(instance, ctx);
                instance.setInitialized(true);
            }

            @Override
            public InjectionTarget<Bus> getDelegate() {
                return injectionTarget;
            }
        });
    }
}