Selectable Ondisable index OOB on 2019.3b10

Hi I have this simple custom button script that worked fine before 2019.3b10:

Code (CSharp):

1. public class ButtonCustom : Button
2. {
3.  
4.     public const string clickSE = "Common_UIright";
5.  
6.     protected override void OnEnable()
7.     {
8.         base.OnEnable();
9.         onClick.AddListener(delegate { PlayButtonSE(); });
10.     }
11.     protected override void OnDisable()
12.     {  
13.         base.OnDisable();
14.         onClick.RemoveListener(delegate { PlayButtonSE(); });
15.     }
16.  
17.     protected virtual void PlayButtonSE()
18.     {
19.         if (Application.isPlaying)
20.             AudioManager.Instance.PlaySE(clickSE, UIManager.Instance.GetPhoneUI());
21.     }
22. }

now it throws following error on runtime:

IndexOutOfRangeException: Index was outside the bounds of the array.
UnityEngine.UI.Selectable.OnDisable () (at C:/Program Files/Unity/Hub/Editor/2019.3.0b10/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/Selectable.cs:521)
ButtonCustom.OnDisable () (at Assets/Scripts/UI/Button/ButtonCustom.cs:22)
UnityEngine.GameObject:SetActive(Boolean)
UIScene:SetVisible(Boolean) (at Assets/Scripts/UI/UIScene.cs:14)
...

I suspect it has something to do with the fix of issue 1160054 about disabled selectable items in 2019.3b10.

 

Ok it turns out I have another script inherit from ButtonCustom with an empty OnEnable override. Nevertheless there is still a potential OOB threat here.