SceneTree.CreateTimer() does not free the timer after its time elapses

[Mooncat25]

Godot version

4.0.beta10.mono.official [d0398f6]

System information

Windows 11 Home 64-bit (Build 22621.963), Intel Core i5 11400F, NVIDIA GeForce RTX 3070

Issue description

While the document says "The timer will be automatically freed after its time elapses.", the Debugger says the opposite.

The timer created by SceneTree.CreateTimer() is not freed automatically after its time elapses. The Object count and Memory usage in the Debugger tab keep increasing.

Steps to reproduce

1. Create new project.
2. Create C# script CreateTimerTester.cs with the following contents:

using Godot;
public partial class CreateTimerTester : Node2D
{
    public override void _Ready()
    {
        base._Ready();
        TestCreateTimer();
    }

    private async void TestCreateTimer()
    {
        var tree = GetTree();
        do
        {
            await ToSignal(tree.CreateTimer(0.1, true, false, true), "timeout");
        }
        while (true);
    }
}

3. Create new scene. Create a Node2D. Attach the script to the node.
4. Play the scene. Observe the Object count and Memory usage in the Debugger tab.

(Optional) 5. If you call TestCreateTimer(); multiple times with a for-loop, it can be more effective. Here is a screenshot of calling it 5000 times and then stopping the loops by a cancellation token after 10 seconds:

The full code for step 5 is in the reproduction project.

Minimal reproduction project

TestCreateTimer.zip

[Mooncat25]

To make sure the issue is not caused by Object.ToSignal(), I have also changed the script as follow and tested again:

using Godot;
public partial class CreateTimerTester : Node2D
{
    public override void _Ready()
    {
        base._Ready();
        TestCreateTimer();
    }

    private void TestCreateTimer() =>
        GetTree().CreateTimer(0.1, true, false, true).Timeout += OnTimeOut;

    private void OnTimeOut() => TestCreateTimer();
}

Result is the same.