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Fixed in 2020.2.X

Fixed in 2019.3.X, 2020.1.X



Found in




Issue ID




Prefabs lose their values if scripts are removed then reintroduced

Scene Management


To reproduce:
1. Create a Monobehaviour Foo with a single int field
2. Create an empty object in the scene and add the Foo behavior to the object
3. Set the components field to 12
4. Create a Prefab from the object
5. Close the Editor
6. Move the Script to a folder outside the project
7. Delete the library folder
8. Open the project in the editor
9. Select the Prefab in the Project view
10. Notice the Inspector says "Prefab is missing script"
11. Copy the Script into the project (and refresh, if autorefresh is disabled)
12. Select the prefab and see the field value

Expected result: The field value is '12'
Actual result: The field value is '0'

Reproducible in: 2018.4.10f1, 2019.2.7f2, 2019.3.0b5, 2020.1.0a6

Note: Reimporting the Prefab will fix the issue

  1. Resolution Note (fix version 2020.2):

    Fixed in 2020.2.0a11

  2. Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0b10

  3. Resolution Note (fix version 2019.3):

    Fixed in 2019.3.15f1

Comments (2)

  1. DanielSnd

    Mar 17, 2021 01:58

    Not resolved. Just had this exact problem in 2019.4.21f1

  2. tcz8

    Apr 01, 2020 17:19

    The point of LTS versions is to work on a bug free code base. Why you don't patch them ASAP is a total mystery to me. Who does any serious work on the alpha versions?

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