The filterDropdown of the table is not the original data

[JackShell2020]

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

Version

1.7.3

Environment

win10 chrome Vue2.x

Reproduction link

https://codepen.io/JackShell/pen/wvoxwEB?editors=1011

Steps to reproduce

codepen

What is expected?

原始数据

What is actually happening?

深拷贝出来的数据

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[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.