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Prefab instance with a script that automatically sets the parent of it creates a duplicate of itself after exiting Prefab mode

Scene Management



Priority: 2Necessary for shipping a final release


Severity: 3Secondary functionality broken

How to reproduce:
1. Download extract and open attached project (
2. Open 'SampleScene'
3. Create an empty object and name it 'parent'
4. Create an instance of 'GameObject' Prefab (object 'parent' will automatically be the parent of it)
5. De-parent the 'GameObject' prefab instance
6. Enter and exit 'GameObject' prefab mode

Expected results: The hierarchy is unchanged or 'GameObject' is the child of object 'parent'
Actual results: 'GameObject' is left unchanged but another 'GameObject' is created as a child of 'parent' with a broken connection to the prefab

Reproducible with: 2018.3.6f1, 2019.1.0b4, 2019.2.0a6

Note: If the 5th step is missed, the Prefab instance connection to the Prefab simply breaks.

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