How to reproduce:

1. Create and open a new project
2. Create 10 GameObjects in the Hierarchy
3. Select any but the last GameObject in the Hierarchy
4. Add a RectTransform Component in the Inspector
5. Observe the Hierarchy

Actual result: The selected GameObject drops to the bottom of the Hierarchy
Expected result: The selected GameObject remains in the same place in the Hierarchy

Reproducible in: 2023.2.0a19, 6000.0.66f1, 6000.3.4f1, 6000.4.0b4, 6000.5.0a4
Not reproducible in: 2023.2.0a18

Reproduced on: Windows 11 Pro (25H2)
Not reproduced on: No other environment tested

Note: Does not reproduce on child GameObjects