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Fixed in 2019.2

Fixed in 2018.3, 2019.1



Found in





Issue ID




Prefab disappears from Prefab Mode when Setting Prefab parent with GameObject.Find

Scene Management


Reproduction Steps:
1. Open "SampleScene" in attached "" project
2. Enter Prefab Mode by double-clicking on the "TestPrefab" in prefabs folder
3. Drag the "TestSetParent" script onto the prefab
4. Observe The Prefab Mode and Console

Expected Behavior: Script tries to look for the desired GameObject in Prefab Mode and if found sets it as a parent
Actual Behavior: Script finds the desired GameObject in the Scene and sets it as a parent, Prefab disappears from Prefab Mode

Reproducible with: 2018.3.5f1, 2019.1.0b2, 2019.2.0a4

Note: Could not test on 2017.4 stream as there is no Prefab Mode

Fixed in 2019.2.0a8

  1. Response avatar

    Resolution Note (fix version 2019.2):

    From 2018.3 using ExecuteInEditMode and ExecuteAlways logic needs to handle the special care:
    In this case you need to check what Stage the GameObject is in before reparenting. Make sure that the GameObject is in the Main Stage (and not a Prefab Stage) before reparenting. E.g:

    using UnityEngine;
    using UnityEditor.SceneManagement;

    public class TestSetParent : MonoBehaviour
    private void OnEnable()
    if (StageUtility.GetStageHandle(gameObject) == StageUtility.GetMainStageHandle())
    transform.parent = GameObject.Find("TestContainer").transform;

    We have also added better error handling when the root GameObject in Prefab Mode is incorrectly been moved to another Stage (e.g the main scenes).

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