The button is not smooth when loading

[wishong]

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

Version

3.1.0-rc.1

Environment

vue3

Reproduction link

https://next.antdv.com/components/button-cn#components-button-demo-loading

Steps to reproduce

https://next.antdv.com/components/button-cn#components-button-demo-loading
滑过 mouseenter me! 按钮，loading 图标是直接出现的

https://2x.antdv.com/components/button-cn#components-button-demo-loading
2.x 版本滑过是有平滑过渡

What is expected?

loading出现不平滑

What is actually happening?

loading出现平滑

[github-actions]

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