微信接口“交易类投诉处理“：https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/business-capabilities/guarantee/complaint.html#%E8%BF%94%E5%9B%9E%E5%8F%82%E6%95%B0%E5%90%AB%E4%B9%89

问题：小程序里“交易保障”中交易类投诉处理接口nickName字段为空是否正常？我们收到的信息为空，不能区分回复是商户回复，还是用户回复。

投诉单号：41613765

支付单号：4200002994202601231230598058

报文：{"errmsg":"ok","complaintOrder":{"headImgUrl":"http://wx.qlogo.cn/mmhead/47CicbLQOxtUUMic65vyzX3X5xdYfkwgabZBJm200QeS8FXU01Dzu9CPeTXl0N2mccpiaL7A7kicThc","orderId":"payorder@_4200002994202601231230598058","openId":"o0vrH6z8hVKqfhVCJM2470lGIauc","createTime":1769150532,"phoneNumber":"15639880880","type":611,"status":209,"customerMaterial":{"content":"测试投诉说明"},"complaintOrderId":"41613765","productName":"实体商品自提2","payTime":"1769150485","totalCostStr":"￥0.01","expireTime":1769324408,"outTradeNo":"5742391926260123","nickName":"赵照小太阳","appealState":0},"item":[{"itemType":108,"time":1769324408,"nickName":"","nanoTime":178735391},{"itemType":109,"time":1769151608,"content":"商家回应以下吧","nickName":"","nanoTime":0},{"itemType":2,"time":1769150614,"content":"补充测试投诉","mediaIdList":["https://open.weixin.qq.com/wxaweb/getimgfrommedia?uin=Mzk1NTc1MTYzNA%3D%3D&pass_key=daf9bdc5abc4e8d0911fed53db88aa96ccd131b7d3081ff297b725ea3a031547697e14bf937fbcf3da7630ad4f7b4edaa92f52d5f936394d37808c32ec2848c743f6ae1de17ee7b652ec2c39442aae1cecea4291bc95e7ec9dfd2c92b0b43bf4ab4e0555a8796748b1acf5f5657200a2e397825a05a485ee7baf16b95b242f20&pass_ticket=CeDapR5XBfc7tMj6LzzNMSJgeADcSZ98jIGIA0QVlKwgwGvamiYwWqSR6Bj%2FLQHVFhRYdoRu2rS8xZyTgl%2FvaXtUuk%2FRsHu5AvDTD3YKfZA%3D&media_id=r1ZQGIGZz_DHORv2YSG73yvj9Q5SppFybEnhDrqOXecd0g_iz2qfLOy4VKu71XcH23vFSERGcQDvJZLTg4GsRA&uniq_id=00&t=7200"],"nickName":"","nanoTime":0},{"itemType":1,"time":1769150532,"content":"测试投诉说明","phoneNumber":"15639880880","nickName":"","nanoTime":0}],"errcode":0,"flag":2}