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Fixed in 2020.2.X

Fixed in 2019.4.X, 2020.1.X

Votes

5

Found in

2019.3

2020.1

Issue ID

1183547

Regression

No

[Serialization] Empty class instances are not deserialized and become null.

Scripting

-

To reproduce:
1. Open LocalizationTests project from the link provided in the edit
2. Delete the "Localization Settings.asset" and create a new one with "Create/Localization/Localization Settings"
3. Notice that the list of Sources is full of class names
4. Save project and quit Unity
5. Open the project again and select the localization settings asset, observe the empty classes

Expected result: Empty classes are not null
Actual result: Empty classes are null

Reproducible in: 2017.4.35f1, 2018.4.14f1, 2019.2.16f1, 2019.3.0f2, 2020.1.0a15

Notes:
1. If the asset file is opened with a text editor it can be seen that it is correctly saved, the classes have just not been deserialized
2. As a workaround add a simple dummy field in the managed reference/class
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Comments (1)

  1. Catsoft-Studios

    Mar 10, 2020 11:40

    Yup, It's a bit odd having to add a dummy field in order to correctly deserialize the class instance. So having something like:

    public interface IAnimal
    { }

    [System.Serializable]
    public class Cat : IAnimal
    { }

    [SerializeReference]
    public IAnimal animal = new Cat();

    Results in a null after restarting Unity. However, if you change the Cat class definition for:

    [System.Serializable]
    public class Cat : IAnimal
    {
    public int dummy = 1;
    }

    It works fine. Hope this helps narrow down the problem.

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