unregister commands not working

[zOmArRD]

Expected Behavior

It is expected that when using the corresponding functions, the command will not be registered in the server.

Actual Behavior

When debugging, I notice that the method always returns false, no matter how you try to unregister

Steps to Reproduce

Checklist:

• [] I included a /debugpaste link
• I made sure there aren't duplicates of this report (Use Search)
• []x I made sure I am using an up-to-date version of Nukkit
• I Made sure the bug/error is not caused by a plugin