Nested Lists of Lists of Lists are leading to NullReferenceException when pressing "+" in the Inspector

[max-critcrew]

Hey,

first of all - we love Alchemy and this is our first issue we're encountering. So we wanted to report it, to see if anyone has a fix already.

Unity Version: 2022.3.17f1 Alchemy Version: 2.0.1

Example reproduction code file:

using System.Collections;
using System.Collections.Generic;
using Alchemy.Inspector;
using UnityEngine;

[Serializable]
public class ContainerClass
{
    [SerializeField] public List<int> listOfInt = new List<int>();

}

[Serializable]
public class SecondContainerClass
{
    [SerializeField] public List<ContainerClass> listOfContainerClass = new List<ContainerClass>();

}


public class MyTest : MonoBehaviour
{
    [SerializeField] public List<SecondContainerClass> listOfListOfList = new List<SecondContainerClass>();

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

    }
}

Simply add this to any GameObject and press plus in the nested lists:

Error in screenshot:

Error as text:

NullReferenceException: Object reference not set to an instance of an object
Alchemy.Editor.Elements.PropertyListView+<>c__DisplayClass0_2.<.ctor>b__2 (UnityEditor.SerializedProperty x) (at ./Library/PackageCache/com.annulusgames.alchemy@b03898d42a/Editor/Elements/PropertyListView.cs:32)
UnityEditor.UIElements.Bindings.DefaultSerializedObjectBindingImplementation+<>c__DisplayClass7_0.<TrackPropertyValue>b__0 (System.Object e, UnityEditor.SerializedProperty p) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Editor/Bindings/BindingExtensions.cs:1010)
UnityEditor.UIElements.Bindings.SerializedObjectBindingContext.UpdateTrackedProperties () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Editor/Bindings/BindingExtensions.cs:844)
UnityEditor.RetainedMode:UpdateSchedulers() (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Editor/RetainedMode.cs:55)

Thanks for your time looking at this and if you got any input or ideas, let us know :)