Bug Scriptable Build Pipeline Build Wrong AssetBundle While Scriptable Object Nest depth >= 2

1. What happened

- given a custom scriptable object have a filed like MyScriptableObject m_RefObject, create 3 object named A, B, C.

- C ref B, B ref A, use SBP CompatibilityBuildPipeline.BuildAssetBundles build 3 assets as individual bundle.

- load bundle A, B, C, load asset A, B, C. Both A and B load success while load C fail, cause a warning ''The referenced script on this Behaviour (Game Object '<null>') is missing!'' and return null.

- switch to UnityEditor.BuildPipeline.BuildAssetBundles both A, B, C load successfully.


2. How to reproduce it using the example attached


- open the Sample Scene and click Play, console will show the asset load failed, all the behavior inside Entry.cs

version:

• com.unity.scriptablebuildpipeline: 1.20.2/ 1.21.9
• unity 2021.3.25f1

@AndrewSkow

 

here is the load code in the example.

Code (CSharp):

1.     public class Entry : MonoBehaviour
2.     {
3.         private void Start()
4.         {
5.             //      ref     ref
6.             // so_2 -> so_1 -> so_0
7.             var bundle0 = AssetBundle.LoadFromFile("Assets/StreamingAssets/so_0");
8.             var bundle1 = AssetBundle.LoadFromFile("Assets/StreamingAssets/so_1");
9.             var bundle2 = AssetBundle.LoadFromFile("Assets/StreamingAssets/so_2");
10.  
11.             // suppose all load success, but so_2 load failed return
12.             LoadAsset(bundle0, "Assets/ScriptableObjects/so_0.asset"); // success
13.             LoadAsset(bundle1, "Assets/ScriptableObjects/so_1.asset"); // success
14.             LoadAsset(bundle2, "Assets/ScriptableObjects/so_2.asset"); // return null with a warning "The referenced script on this Behaviour (Game Object '<null>') is missing!"
15.            
16.             bundle2.Unload(true);
17.             bundle1.Unload(true);
18.             bundle0.Unload(true);
19.         }
20.  
21.         void LoadAsset(AssetBundle bundle, string path)
22.         {
23.             var lowerPath = path.ToLower();
24.             var asset = bundle.LoadAsset(lowerPath);
25.             if (asset == null)
26.             {
27.                 Debug.LogError($"load {lowerPath} failed! bundle {bundle.name} path = {bundle.GetAllAssetNames()[0]}");
28.             }
29.             else
30.             {
31.                 Debug.Log($"load {lowerPath} success!");
32.             }
33.         }
34. }

 

inspect these bundles on AssetStudio can see both so_0, so_1 have a valid script path id, but so_2 doesn't.