Tree component ,after clicking, the data format of the data source will change

[yemaozi999]

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

Version

3.1.0-rc.3

Environment

node16

Reproduction link

Steps to reproduce

The default selection data of the tree under checkstrict is a one-dimensional array [1,2,3], but it becomes an object when clicked

What is expected?

The incoming data is one-dimensional, the dynamic data after clicking is one-dimensional, or the incoming object array after click is also object array

What is actually happening?

The default selection data of the tree under checkstrict is a one-dimensional array, but once clicked, it becomes a object array of checked: and halfchecked,When I first passed the object array, the whole tree couldn't be clicked,
and halfChecked is empty all the time

[tangjinzhou]

重复 #5395

[github-actions]

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