picker的mode=‘region’,滚动省份以后，市和区的数据全部变成undefined,关闭后再打开就会重新把数据渲染好，再次操作还是会出现同样的问题
相关问题
相关文档
- picker#省市区选择器：mode = region 1.4.0: 小程序/开发/组件/表单组件/picker
- Inquiry Delivery Mode: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
- Set up delivery mode: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Set up delivery mode
- Interface call request specification: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
- Request Parameter Sample: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。
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