Click the second to last CollapsePanel ,it will collapse with the last CollapsePanel togather

[nabaonan]

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

Version

2.2.0-beta.3

Environment

Vue3.1.1, MacOS 10.15.7

Reproduction link

Steps to reproduce

Click the second to last CollapsePanel

What is expected?

The second panel will not affect the last panel

What is actually happening?

The second panel affect the last panel

[tangjinzhou]

https://codesandbox.io/s/bug-collapse-panel-forked-3i2mp

set key for everyone

[github-actions]

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