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Fixed in 2020.1

Fixed in 2018.4, 2019.3



Found in






Issue ID




Prefab Hierarchy is reordered after upgrading a project to a newer version of Unity

Scene Hierarchy


How to reproduce:
1. Download the user-submitted package(PrefabTestPackage.unitypackage)
2. Create a new Unity project with one of the versions, marked as 'Not reproducible'
3. Import the package
4. Open the Assets\GUI\Controls\BasePrefabs\EscapeMenuPrefabs\NewSaveSlot.prefab
5. Note the order of the prefab hierarchy(UITab is in the 3rd position)
6. Close the project and open it in one of the versions, marked as 'Reproducible'
7. Open the Assets\GUI\Controls\BasePrefabs\EscapeMenuPrefabs\NewSaveSlot.prefab again
8. Note the order of the prefab hierarchy

Expected result: hierarchy order remains the same(UITab is in the 3rd position)
Actual result: hierarchy order has changed(UITab is in the 5th position)

Reproducible with: 2018.4.14f1, 2018.4.16f1, 2019.2.14f1, 2019.2.19f1, 2019.3.0f1, 2019.3.0f6, 2020.1.0a11, 2020.1.0a20
Not reproducible with: 2018.4.13f1, 2019.2.0a1, 2019.2.13f1, 2019.3.0a1, 2019.3.0b12, 2020.1.0a1, 2020.1.0a10
Could not test with: 2017.4.36f1(Old prefab system is used)

  1. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0a22

  2. Response avatar

    Resolution Note (fix version 2019.3):

    Fixed in 2019.3.5f1

  3. Response avatar

    Resolution Note (fix version 2018.4):

    Fixed in 2018.4.18f1

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