"Failed creating toolbar element from ID..." error is thrown when resetting the Scene view Overlay layout while an Asset Transformer Toolbox overlay is active

Steps to reproduce:

1. Create a new 3D URP project
2. Install the Asset Transformer Toolkit package (com.unity.industry.toolkit)
3. In the Scene view observe Transformer Toolkit overlays appear
4. Open any overlay, e.g. Decimate
5. Click ~ on the keyboard in the Scene view to open Overlay Menu
6. Click on the "Default" dropdown and select it again to reset
7. Observe the Console

Actual results: "Failed creating toolbar element from ID "Optimize"." error is thrown when resetting the layout

Expected results: No errors are thrown

Reproducible with versions: 3.3.0 (6000.3.13f1, 6000.4.4f1, 6000.5.0b4, 6000.6.0a3)

Tested on (OS): macOS 26.3

First few lines of warning:

• Failed creating toolbar element from ID "Optimize".
  System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
  Parameter name: index
    at System.Collections.Generic.List`1[T].get_Item (System.Int32 index) [0x00009] in <c5eeda5e65d44b388e164c6c5cfe0702>:0 
    at UnityEditor.Overlays.OverlayContainer.GetContainerSection (System.Int32 index) [0x00001] in /Users/bokken/build/output/unity/unity/Editor/Mono/Overlays/OverlayContainer.cs:185