Group section never appears again

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Describe the bug
Group section opened once , then closed, it never appears again.

Code Sample

using TriInspector;
using UnityEngine;

public class NewMonoBehaviourScript : MonoBehaviour
{
    public Test1 test1;
    public Test2 test2;
}

[System.Serializable]
[DeclareFoldoutGroup("Group")]
public class Test1
{
    [Group("Group")] public float Speed = 10f;
}

[System.Serializable]
[DeclareFoldoutGroup("Group")]
public class Test2
{
    public int n;
    [Group("Group")] public float Speed = 10f;
}

Screenshots

20251022-0357-03.2547783.mp4

Desktop: Windows11
Unity version: 6.2.7f2
Tri Inspector version: c8b54a7

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Now I'm use InlineProperty as workaround.