Calling SendCustomEvent from AnimationEvent

[ikuko]

Describe the bug in detail:
Call SendCustomEvent from AnimationEvent using Animator etc.
Some situations cause problems when running in the editor.

Provide steps/code to reproduce the bug:

1. Prepare the following USharp code and set it in UdonBehaviour.

public class Test : UdonSharpBehaviour
{
    int num;

    private void Start()
    {
        num = 123;
    }

    public void Method()
    {
        Debug.Log($"num={num}");
    }
}

2. Execute SendCustomEvent with "Method" argument in AnimationEvent.

3. When executed in the editor, the following is output to the console.

num=123
num=0

The first output is the result of being run via Udon Behavior.
The second output is the result of a reflection run via UdonSharpBehaviour.

Expected behavior:
It should only be called once, but it has been called twice.
The second call should not be made.

Additional Information:
Provide any additional information here.