ArgumentException is thrown when a "None" value is passed to a GameObject property via UnityEvent

Unity: uGUI

2023.2.X

2023.1.X

2022.3.X

2021.3.X

By throwing the exception, users get warned of a missing assignment. This is as designed and not an actual bug.

Reproduction steps:
1. Open the "IN-42644.zip" project
2. Open “Assets/Scenes/SampleScene”
3. Enter Play mode and observe the Console

Expected result: No errors are thrown
Actual result: ArgumentException is thrown

Reproducible with: 2021.3.27f1, 2022.3.2f1, 2023.1.0f1, 2023.2.0a18

Reproducible on: Windows 10

Note: Full error in internal comments