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Won't Fix

Votes

0

Found in

2018.3.0a6

2018.3.0b1

Issue ID

1084109

Regression

Yes

Error: "Destroying a GameObject inside a Prefab instance is not allowed" when destroying child with Prefab from Unity 5.4

Asset - Database

-

Steps:
1. Open user's attached project ("BugDestroyInsidePrefab5.2_Copy.zip")
2. Enter Play mode
3. Drag and drop Assets/Resources/PrefabTest to the Scene window

Expected: child Game object of PrefabTest gets destroyed.
Actual: child Game object of Prefab is not destroyed, an error is shown.

Reproduced with: 2018.3.0a6, 2018.3.0b3, 2019.1.0a2.
Not reproduced with: 2018.3.0a5, 2018.2.8f1 and older.

Note:
An error "InvalidOperationException: Destroying a GameObject inside a Prefab instance is not allowed" is shown when a prefab game object is trying to destroy its' child Game object. A child Game Object is not properly destroyed.
This error only appears from Prefabs generated with Unity 5.4 and older.
The bug appeared with the introduction of Nested Prefabs.

  1. Resolution Note:

    There is an issue with the PrefabTest.prefab file as it is saved in a way that the user supplied scripts do not expect it to be saved.
    It should not have a "Sub-Object" inside itself, as OnDestroy should have cleared it out, but for some reason it is there.
    Making the prefab dirty in prefab mode will fix the issue as there is nothing from a code perspective that we can do to fix this.

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Comments (2)

  1. unity_3M7vQK2p2Qly1A

    Mar 27, 2021 22:04

    I can do this, I solve this. Just destroy all prefab transforms. I have root _Canvas, and Prefab _Panel. And I delete like this:

    foreach (Transform child in _Canvas.transform)
    GameObject.Destroy(child.gameObject);
    Childer objects is prefab objects.

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