a-select设置了allowClear后，点击清除按钮会把绑定的属性从对象中删除

[wangfpp]

请提供有效的复现链接 复现链接如下 select的单选 clear会把formModel的key给清除 不应该是只清除value吗

[ Originally posted by @tangjinzhou in #2993](https://codesandbox.io/p/sandbox/quizzical-rubin-62r4dw?file=%2Fsrc%2FApp.vue)

[github-actions]

Hello @wangfpp, your issue has been closed because it does not conform to our issue requirements. Please use the Issue Helper to create an issue, thank you!

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