Steps to reproduce:

1. Open a Unity Project
2. Open Undo History via ctrl + u
3. Move the Undo History Window to be somewhere visible during rest of steps
4. Create a new Animator Controller via Assets > Create > Animation > Animator Controller
5. Open the new Animator Controller in the Animator Window by double-clicking on the asset
6. Create two Nodes via right-click > Create State > Empty
7. Connect the two nodes together via a transition (right-click > Make Transition)
8. Select the transition then delete it with del key
9. Observe how both selecting and destroying the object is added to the Undo History. This is expected
10. Undo the deletion (Ctrl + Z)
11. Add any Animation to both the two states (HumanoidDefault is an animation that is in Unity by default. You will need to toggle package visibility to see this one))
12. Ensure that the Inspector Window is visible (so you will be able to see the Animation Preview section) and select the transition
13. Press del key to delete the transition

Actual results: Instead of 'Select' being added to the Undo History, it adds 'Add UniversalAdditionalLightData'. 'Delete' isn't added to the Undo History at all, instead it just removed the 'Add UniversalAdditionalLightData'. Pressing Ctrl + Z to Undo will not bring back the deleted transition.

Expected results: Both selecting and deleting the transition should appear in the Undo History when there is an Animation Preview in the Inspector upon selecting

Reproducible with versions: 6000.1.0b3, 6000.1.0b2, 6000.0.35f1

Not reproducible with versions: 7000.0.0a15, 6000.1.0b1, 6000.0.34f1, 2022.3.54f1, 2021.3.45f1

Can't test with versions: - 

Tested on (OS): Windows 11

Notes: -