Select can not be searched under big data

[djkloop]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

2.0.0-beta.15

Environment

OSX 10.14.6 / Microsoft Edge 86.0.622.63 / Vue 3.0.2

Reproduction link

Steps to reproduce

/// 搜索有问题
/// https://codesandbox.io/s/weathered-sound-42v5u?file=/src/App.vue

What is expected?

Virtual list search can search correctly

What is actually happening?

Virtual list search cannot search correctly

[tracy2zhang]

我也遇到了这个问题，长列表在刚点开的时候，很多比较靠后的数据是搜索不到的，但是如果一直往下滚动，然后在搜，就可以搜索的到了，感觉可能跟加了虚拟列表有关

[github-actions]

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