第一次点击 a-dropdown 时，a-menu slot="overlay" 位置错位

[mxue12138]

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

Version

1.6.1

Environment

操作系统：macOS Mojave 10.14.6。浏览器：Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36。Vue：2.6.11

Reproduction link

Steps to reproduce

第一次点击菜单时位置会错位，但是之后点击位置就正常了，，，每次刷新后第一次点击都会这样错误

What is expected?

期望下拉菜单显示在正确的位置

What is actually happening?

实际显示的位置错位，一般错位在右侧

[nooldey]

https://codesandbox.io/s/antd-vue-w0i9g?file=/src/App.vue

类似问题：
初始化设置placement=bottomCenter;
首次展开，menu位置在相对title居中，正常；
第二次展开，menu位置在相对title左侧，错位；

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.