Assets referenced by polymorphism [SerializeReference] not found

[Staarter]

Description of the bug

Assets that are referenced by polymorphism using the tag [SerializeReference] are not found by AUD.

Reproduction steps

• Create scripts using these class :

  
  using System.Collections.Generic;
  using UnityEngine;

[System.Serializable] public class ContainerBase { }

[System.Serializable] public class ContainerGO : ContainerBase { public GameObject go; }

[CreateAssetMenu(fileName ="AUD_SerializeReference", menuName = "AUD_SerializeReference")] public class DebugAUD_SerializeReference : ScriptableObject { [SerializeReference] public List test = new List();

private void OnValidate()
{
    // Add an empty element here: we cannot do it in inspector by default
    test.Add(new ContainerGO());
}

}

[CreateAssetMenu(fileName ="AUD_Default", menuName = "AUD_Default")] public class DebugAUD_Default : ScriptableObject { public List test = new List(); }

- Create the two ScriptableObject 'AUD_Default' & 'AUD_SerializeReference'.
- Add a prefab gameObject into theses two 'test' fields.
- Try to search this prefab using the AUD window
- Only the ScriptableObject 'AUD_Default' will be found as using the prefab.

![image_2023-02-21_182622092](https://user-images.githubusercontent.com/9812442/220416775-836a6af3-8d46-4b74-b696-add4ee35c46a.png)

**Platform specs**

Please provide the following info if this is a Unity 3D repository.

- Unity version: 2020.3.16
- Platform: Windows
- How did you download the plugin: Asset Store (the asset is up to date)

**Additional info**

I know that Unity have made changes about SerializeField in 2021 or 2022, the serialization can be changed, but I am using 2020..

[yasirkula]

Thank you for bringing this to my attention! I'll include the fix in the next release but in the meantime, you can apply the fix yourself by changing these lines: https://github.com/yasirkula/UnityAssetUsageDetector/blob/8072530c2cc666007d79f0a8aae038a4d2d26878/Plugins/AssetUsageDetector/Editor/AssetUsageDetectorSearchFunctions.cs#L1421-L1425

As follows:

case SerializedPropertyType.ManagedReference:
    object managedReferenceValue = GetRawSerializedPropertyValue( iterator );
    propertyValue = managedReferenceValue as Object;
    searchResult = SearchObject( PreferablyGameObject( managedReferenceValue ) );
    enterChildren = false;
    break;

[Staarter]

Thank you for your reply! This fix works like a charm, good job.