Custom filters do not work when the field hierarchy is deep.

[Shi-553]

There is a bug where custom filters do not work when the field hierarchy is deep.
This is necessary if you want to wrap type filtering in a class.

For example, Once this is corrected, it can be defined as follows

[System.Serializable]
public class SerializeInterface<T> where T : class
{
    [SerializeField, Pickle(FilterMethodName = nameof(CustomFilter))]
    Object obj;

    public T Interface
    {
        get => obj as T;
        set => obj = value as Object;
    }

    private bool CustomFilter(ObjectTypePair item)
    {
        return item.Object is T;
    }
}

It can be used like this

public class Foo: MonoBehaviour
{
    [SerializeField]
    SerializeInterface<IBar> bar;
    [SerializeField]
    SerializeInterface<IBar>[] bars;
}

If you format it using custom property drawers, it will look like this