如何扩展带有@ConditionalOnMissingBean注释的默认bean？

@Configuration
public class MyConfig {

    @Bean
    @ConditionalOnMissingBean(DefaultBean.class)
    public DefaultBean defaultBean() {
        return new DefaultBean();
    }

    @Bean
    @ConditionalOnMissingBean(DefaultBean.class)
    public ExtendedBean extendedBean(DefaultBean defaultBean) {
        return new ExtendedBean(defaultBean);
    }
}

public interface MyInterface {
    void doSomething();
}

public class DefaultBean implements MyInterface {
    @Override
    public void doSomething() {
        // 默认的实现逻辑
    }
}

public class ExtendedBean implements MyInterface {
    private final DefaultBean defaultBean;

    public ExtendedBean(DefaultBean defaultBean) {
        this.defaultBean = defaultBean;
    }

    @Override
    public void doSomething() {
        // 扩展的实现逻辑
        defaultBean.doSomething(); // 调用原始默认bean的方法
        // 扩展的其他逻辑
    }
}