table headerCell slot have no effect

[hipi]

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

Version

3.0.0-alpha.12

Environment

win10 ,ChromeV95,vue 3.2

Reproduction link

https://codepen.io/yuyehack/pen/oNeRwoR

Steps to reproduce

ant-design-vue@3.0.0-alpha.12 版本，官方文档示例，使用官方的 codesandbat-design-vue@3.0.0-alpha.12和 自己另写了 codepen 表格的headerCell 插槽都没有效果

What is expected?

实际展示 headerCell 插槽效果

What is actually happening?

没有展示

[lamelamb]

2021.1.14 3.0.0 beta 6 still has the same bug, looks like the beta version problem, switch ant-design- vue to 2.xx verison can shortly resolve the problem

[github-actions]

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