Unity Serialized Dictionary won't serialize with String, List type of dictionary

[Sandro.G]

Hello, I’m not sure if this is even supported but wanted to report in case this is a bug.

Issue is simple, when I have dictionary with String Key, and List of classes as value it won’t save dictionary values. After code recompile or opening/closing editor all values are lost.

‌

Here is example setup.

‌

[System.Serializable]
public class SampleDataHolder
{
    public string Data;
}

[System.Serializable]
public class SampleDataHolderDictionary : UnitySerializedDictionary<string, List<SampleDataHolder>> { }

[System.Serializable]
public class DataItems : ScriptableObject 
{
  public SampleDataHolderDictionary Data = new SampleDataHolderDictionary();
}

So in this case Data dictionary in DataItems won’t save your values.

I have a simple workaround where I can create wrapper class for List, like

[System.Serializable]
public class SampleDataHolder
{
    public string Data;
}

[System.Serializable]
public class SampleDataHolderList
{
    public List<SampleDataHolder> DataItems = new List<SampleDataHolder>();
}

[System.Serializable]
public class SampleDataHolderDictionary : UnitySerializedDictionary<string, SampleDataHolderList> { }

[System.Serializable]
public class DataItems : ScriptableObject 
{
  public SampleDataHolderDictionary Data = new SampleDataHolderDictionary();
}

‌

Unity 2020.3.25f1, Windows 10, Editor only is not enabled, Odin 2.1.12.0 (I’ll try upgrading to see if it is fixed, didn’t realize so many versions released :D)

‌