Unity Issue Tracker - Error “PersistentManager::ReadObject must be called from the main thread“ when using async addressable loading with async instantiation for prefabs that contain a particle system with a sub emitter

Fixed

Fixed in 2022.3.66f1, 6000.0.56f1, 6000.2.1f1, 6000.3.0a4

Votes

8

Found in

2021.3.53f1

2022.3.64f1

6000.0.49f1

6000.1.12f1

6000.2.0b9

Issue ID

UUM-112023

Regression

No

Error “PersistentManager::ReadObject must be called from the main thread“ when using async addressable loading with async instantiation for prefabs that contain a particle system with a sub emitter

-

Jan 31, 2025

Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/OutdoorsScene.unity” Scene
3. Enter the Play Mode
4. Observe the Console

Expected result: No Errors exist
Actual result: Error “PersistentManager::ReadObject must be called from the main thread“ is present

Reproducible with: 2.2.2 (6000.2.0a2), 2.3.16 (6000.0.37f1, 6000.1.0b5, 6000.2.0a2)
Could not test with: 1.23.1 (2022.3.56f1) (Assets\AddressableLoadTest.cs(19,20): error CS1061: 'AsyncInstantiateOperation<GameObject>' does not contain a definition for 'GetAwaiter' and no accessible extension method 'GetAwaiter' accepting a first argument of type 'AsyncInstantiateOperation<GameObject>' could be found)

Reproducible on:
Play Mode

Not reproducible on:
Windows Standalone Player

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

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