How to reproduce:
1. Open the attached "IN-138563_Kyoto.zip" project
2. Open the "Wing Test" scene
3. In the Hierarchy, select "Bravo 3", "Bravo 4" (both children of "Bravo Wing"), "StarSparrow (1)", and "StarSparrow" GameObjects
4. Press the "Reform Wing" overlay button in the Scene View
5. Trigger an Undo action (Ctrl + Z)
6. Observe the Console
Actual result: An error is thrown in the Console: "Undo: Already found nextRootTransform, but with different state cached: transform 'StarSparrow', next transform 'StarSparrow (1)'. Please report a bug."
Expected result: No errors are thrown in the Console
Reproducible with: 6000.0.0f1, 6000.0.75f1, 6000.3.16f1, 6000.4.8f1
Could not test with: 6000.5.0b9, 6000.6.0a5 (Plugins required for the reproduction throw errors)
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Note: Full error message:
"Undo: Already found nextRootTransform, but with different state cached: transform 'StarSparrow (1)', next transform 'StarSparrow'. Please report a bug.
UnityEditor.EditorApplication:Internal_CallGlobalEventHandler ()"