ValueDropdownLists call IValueDropdownItem.GetValue() far more often than they should

I'm trying to use my own class that implements IValueDropdownItem to create a dropdown that calls a delegate when an item is selected (and returns the result of the delegate). However, the value dropdowns seem to call IValueDropdownItem.GetValue() many many times, instead of only when the item is actually selected.

In fact, it seems to call IValueDropdownItem.GetValue() even when the dropdown hasn't been opened yet.

To reproduce, toss the following script onto an empty, and notice that every time you select the GameObject in the hierarachy, you'll see the debug line in the Console. You'll also see 3(!) calls whenever you open the dropdown.

using System;
using System.Collections.Generic;
using UnityEngine;

using Sirenix.OdinInspector;

public struct DelegateValueDropdownItem<T> : IValueDropdownItem
{
    private string m_text;
    private Func<T> m_delegate;

    public DelegateValueDropdownItem(string text, Func<T> p_delegate)
    {
        m_text = text;
        m_delegate = p_delegate;
    }

    public string GetText()
    {
        return m_text;
    }

    public object GetValue()
    {
        return m_delegate.Invoke();
    }
}

public class OdinDebug : BaseBehaviour
{
    [ValueDropdown("GetObjects")]
    public object Test;

    protected IEnumerable<DelegateValueDropdownItem<object>> GetObjects()
    {
        return new List<DelegateValueDropdownItem<object>>()
        {
            new DelegateValueDropdownItem<object>("Test", () => { Debug.Log("IValueDropdownItem.GetValue() called!"); return null; }),
        };
    }
}

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