The virtual list in Select Component is can't scroll to the end

[StereoApp]

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

Version

3.0.0-beta.2

Environment

Windows 10; Chrome 96; Vue 3.2.16

Reproduction link

Steps to reproduce

In a scrollable options list, you can't scroll to the end, For example, to select the last item.

What is expected?

Scroll to the end

What is actually happening?

Can't scroll to the end

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官网下拉多选的例子可复现，25个选项只能选到第22个，感觉是虚拟列表的总高度计算出了一点小问题

[github-actions]

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