- [ ] I have searched the [issues](https://github.com/vueComponent/ant-design-vue/issues) of this repository and believe that this is not a duplicate. ### Version undefined ### Environment 选择第一个选项之后,可以完成填充,但再选择第二个选项填充就清空了 ### Reproduction link [](https://codesandbox.io/s/vue-antd-template-forked-erdw0?file=/src/App.vue) ### Steps to reproduce 选择第一个选项之后,可以完成填充,但再选择第二个选项填充就清空了 ### What is expected? 选择第一个选项之后,可以完成填充,选择第二个选项填充第二个选项设置的值 ### What is actually happening? 选择第一个选项之后,可以完成填充,但再选择第二个选项填充就清空了 <!-- generated by issue-helper. DO NOT REMOVE -->