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Timeline Signals are not received by Signal Receiver when TimelineAsset is loaded from an AssetBundle



Reproduction steps:
1. Open user's attached project "Timeline asset bundle bug" and scene "MyScene"
2. Enter Play Mode
3. Press "Load timeline from asset bundle"

Expected result: Timeline Signals are received by the Signal Receiver and logged
Actual result: No Signals are received by the Signal Receiver

Reproducible with: 2019.2.20f1, 2019.3.0f6, 2020.1.0a21
Could not test with: 2017.4.36f1, 2018.4.16f1 (project breaks)

  1. Resolution Note (2020.1.X):

    The signal asset loaded by the assetbundle is a clone of the one in the project. Thus the signal receiver, being part of the scene, is no longer linked to it. To maintain the link between the signal receiver and the signal, the signal receiver must be also added to the asset bundle, for example, as a prefab. Another workaround is to rebind the signal receiver to the signal assets loaded in the asset bundle using the signal receiver API.

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