Steps to Reproduce:
1. Create a new project in Unity
2. Make sure Hierarchy V2 is enabled in Settings->General->“Use new Hierarchy Window”
3. In the Hierarchy, create two GameObjects and drag one onto the other to nest it as a child
4. In the Hierarchy, select the child GameObject
5. Press the Left Arrow key
6. Observe the Hierarchy selection and the Inspector
Actual Result: The Hierarchy selection changes to the parent GameObject, but the Inspector continues to display the previously selected child GameObject
Expected Result: The selection moves to the parent GameObject, and the Inspector updates to display the parent
Reproducible with: 6000.3.0a2, 6000.3.19f1, 6000.5.3f1, 6000.6.0b3, 6000.7.0a2
Could not test with: 6000.0.79f1, 6000.3.0a1 (Hierarchy V2 is not available in these versions)
Reproducible on: MacOS 26.5 (M1), Window 11 (by reporter)
Not reproducible on: No other environments tested
Note: This feature works as expected on Hierarchy V1