Question ManagedStaticReferences when unload unused resources

I have some assets (sprite) need unload after changing scene async. After changing scene, the assets are still there and the only reference is ManagedStaticReferences.



And this is the snapshot from the memory profiler (click on the ref count):

The question are:
1. What is it? Why does it keep reference the sprite?
2. How can I track those ref?

Btw, can I use Weak Ref to store loaded asset? I did use it in Unity 2019.2 and it run perfect with Resources.UnloadUnused but is it ok? Thanks for your concern!

Note: I use Unity 2019.4.16f1 now

 

This is the process I use, hope it explain well:

I use async to load scene additive and just use Resource.UnloadUnused (not GC.Collect). The same for unload scene. I use coroutine to wait for the process to complete. Snapshot 2 still have some resource in SceneA just like the images I show in the post. And the resource that I need to unload is still in the unload bundle cause I just want to unload some of them which don't use, not all. Hope it's not the reason in my case

Note: Forgot to mention, the bold text is the active scene

Does that mean it doesn't increase ref count? And the null part you mention, instead of calling if (obj == null), call if (obj) is more precise, doesn't it?

Btw, how can I track the Unity part in the memory profiler (the standard one, not the memory profiler package)? I profile the memory on the mobile and Unity part sometime take a lot of memory

 

I've just update Memory profiler and take a snapshot2 again and this is what I get:

I thought we can use Resource.UnloadUnused even though these assets in the bundle cause I did it in the 2019.2
This is the result I want to achieve:
https://answers.unity.com/questions/560195/does-resoucesunloadunusedassets-frees-asset-bundle.html

 

Yup, I use 1 asset bundle to store some UI assets. And not only scene A, I use those asset for scene B and C as well

That's why I stiil reference the asset bundle in my code cause I thought I can unload a part of loaded asset using Resources.UnloadUnusedAssets


As I understand from your explanation, if I don't use the pt.1 anymore but still ref the AB, I can't unload this part when using Resources.UnloadUnusedAssets, right? So the only choice to unload this part is to unload all the bundle?

 

Thanks a lot for your reply. I've been wandering around this problem these days and got no where else to ask. Save my day =)))

 

I will. Hope they make it more clear in the doc about how the asset bundle, addressable and resource work with each other.
Anyway, that should work for now