MutableLiveData未正常更新状态：加载状态无法切换问题

我在从服务器下载数据时，尝试通过postValue提交Loading状态来向用户显示进度条，代码如下：

private fun loadBottomSheetItems(currentViewState: BusinessMapViewState.Display, getBusinessByIdsRequest: GetBusinessByIdsRequest) {
 
    viewModelScope.launch {
        _businessMapViewState.postValue(
            currentViewState.copy(
                bottomSheetState = BottomSheetViewState.Loading <--------------- 始终保持该状态！
            )
        )
 
        val responseFlow = businessRepository.getBusinessListByIds(
            getBusinessByIdsRequest
        )
 
        responseFlow.collect { result ->
            if (result.isSuccess()) {
                val businesses = result.asSuccess().value.businessList
 
                _businessMapViewState.postValue(
                    currentViewState.copy(
                        bottomSheetState = BottomSheetViewState.Display(
                            items = businesses.map { business ->
                                BusinessListCardItemModel(
                                    businessId = business.id,
                                    businessName = business.name
                                )
                            }
                        )
                    )
                )
            } else {
                _businessMapViewState.postValue(
                    currentViewState.copy(
                        bottomSheetState = BottomSheetViewState.Error
                    )
                )
            }
        }
    }
}

提交Loading状态后，数据加载完成该状态却无法改变。如果移除Loading状态的postValue代码块，或添加延迟，数据就能正常显示，但我需要显示进度条。我还尝试将Loading状态的postValue代码块移到viewModelScope外，依旧没有变化。

更新
我已解决问题，是代码的其他部分修改了UI状态 🙈

内容的提问来源于stack exchange，提问作者Ilya Shutov