Unity Issue Tracker - Assets are referenced by ManagedStaticReferenced when Scene is unloaded using SceneManager.UnloadSceneAsync

Fixed

Votes

7

Found in

2018.4

2018.4.22f1

2019.4

2020.3

2021.1

2021.2

Issue ID

1253963

Regression

No

Assets are referenced by ManagedStaticReferenced when Scene is unloaded using SceneManager.UnloadSceneAsync

uGUI

-

Jun 08, 2020

How to reproduce:
1. Open the attached 'UiMaskBug.zip' project
2. Open 'Empty Scene' Scene
3. Enter Play Mode
4. Press 'Load' button in the Game View
5. Press the 'Unload' button in the Game View
6. Open Window > Analysis > Profiler
7. Select Memory module
8. Switch from Simple to Detailed view
9. Select Take Sample Playmode to capture detailed memory usage
10. Expand Assets and Texture 2D dropdowns

Expected result: 'bg' texture is not referenced by ManagedStaticReference and loaded in memory
Actual result: 'bg' is referenced by ManagedStaticReference and loaded in memory

Reproducible with: 2018.4.36f1, 2019.4.29f1, 2020.3.14f1, 2021.1.15f1, 2021.2.0b4
Not reproducible with: 2022.1.0a3

Notes:
- Video of reproduction attached in Edit
- Using UnloadSceneOptions.UnloadAllEmbeddedSceneObjects does not solve the issue

Resolution Note:

Not reproducible since 2021.1.10f1, seems to be fixed by unknown PR, which has also been backported and is present in both 2019.4 and 2020.3

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Comments (1)

Eldirfar

Jul 14, 2020 10:14

Current fix for this is adding this script to every GameObject with UiMask

public class UiMaskReferenceFix : MonoBehaviour
{
private void OnDestroy()
{
var image = GetComponent<Image>();
if (image != null)
{
image.sprite = null;
}
}
}

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