Unsupported type SceneReference

[determinationlove]

I use Unity 2022.3.6f1

I assign a value to SceneName in a script that contains OnValidate()

[SerializeField] private SceneReference nextScene;
public string SceneName = "";

#if UNITY_EDITOR
void OnValidate()
{
    SetMissionValue();
}
#endif

void Awake()
{
    SetMissionValue();
}

void SetMissionValue()
{
    if (nextScene.State == SceneReferenceState.Regular)
        SceneName = nextScene.Name;
}

The editor throws an error:

Unsupported type SceneReference
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

[determinationlove]

oh my god
I found that this was just because I replaced UnityEngine.Object in the script with SceneReference.
The objects to which this script was applied in other scenes had not yet been assigned a SceneReference value.
When I assigned values ​​to all SceneReferences, the error did not appear again.