swift SDK,即时通讯，临时对话无法获取conversation.creator

SDK 版本 LeanCloud-Swift-SDK/17.6.0
...创建对话：
do {
try Client.current.createTemporaryConversation(clientIDs: members, timeToLive: 3600)
{(result) in
switch result {
case .success(value: let tempConv):

                print("临时对话creator:  \(tempConv.creator)")
            case .failure(error: let error):
                UIAlertController.show(error: error, controller: self)
            }
        }
    } catch {
        UIAlertController.show(error: error, controller: self)
    }

...接收:
Client.addEventObserver(key: self.uuid) { [weak self] (client, conversation, event) in{
print("临时对话creator (conversation.creator)")
}

以上代码分别在真机和模拟器运行（真机创建临时对话，模拟器接收信息），真机能打印出creator，模拟器打印的是nil