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我正在学习nav2 bt方面的基础 发现一个疑问 就是在bt调用导航节点的时候，如果导航节点返回了false，则意味着失败，就调用recover恢复节点
可是bt怎么发现导航节点返回了false？ 我翻看了前面的自定义导航插件和路径追踪插件教程，也没有发现导航失败返回false的地方