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[Improved prefabs] Joint prefab loses all data when its prefab is deleted from the project

Scene Management


A joint prefab which is applied as an override to another prefab loses all data when its prefab is deleted from the project. Refer the attached video.

Steps to reproduce:
1) Create a new project
2) Create an empty gameObject > Create a prefab out of it. Call it prefab 'A'.
3) Create an empty gameObject > Add component Character Joint > Create a prefab of this gameObject. Call this prefab 'B'.
4) Add B as a child of A > Apply override.
5) Duplicate prefab B
6) Delete prefab B from the project

Actual result: Prefab B which was overridden loses all data in hierarchy and creates an empty child gameObject as well.
Expected result: Prefab loses instance in hierarchy as it's been deleted from the project.

Occurs on: 2019.3.0a4, 2019.3.0a1
Not reproducible on: 2019.2.0b4

Environment: Both Windows and Mac

  1. Resolution Note (2019.3.X):

    This behavior is by design. There is no data loss as the data for the component is stored in the Prefab Asset only, so when that asset is deleted by the user, the user has deleted the data themselves.

    The reason there is left-over GameObjects and for the nested Prefab a dummy child object as well, is to retain enough information to be able to restore all data if the deleted asset is restored again, for example via version control or via dragging it out of the trash and back into the project in its original location.

Comments (2)

  1. johndd110

    May 06, 2020 12:33

    You have done a great job on this article. It’s very readable and highly intelligent. You have even managed to make it understandable and easy to read. You have some real writing talent. Thank you.
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  2. Belt27

    Aug 15, 2019 11:19

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