tree业务场景太少了

[Pretend-dc]

Description

Explain the issue you met, and describe what you expected to be. If you can write in English, we will be very grateful.

Reproduce Steps

1. [First Step]
2. [Second Step]
3. [and so on...]

Error Trace (if possible)

It's better to post up the error stack for us to trace this issue.

Solution

What needs to be done to address this issue? Ideally, provide a pull request with a fix.

Additional Information

Any additional information, configuration or data that might be necessary to reproduce the issue.