我的liveData有一个问题，它没有用信息更新片段，我觉得它在某个特定的时刻退订了viewLifecycleOwner，有没有办法跟踪liveData的订阅，看看它是否退订了？谢谢！
碎片

val loginResult: MutableLiveData<RequestResult<LoginResponse>> by lazy {
        MutableLiveData()
    }
            
            
             vm.loginRequestResult.observe(viewLifecycleOwner) {
                when (it) {
                    is RequestResult.Success -> vm.navigateToSetLocation()
                    is RequestResult.Error -> showErrorIncorrectEmailOrPassword()
                }
            }

视图模型：

when(response){
            is RequestResult.Success ->  loginRequestResult.value = response
            is RequestResult.Error -> loginRequestResult.postValue(response)
        }