Prefab override markers in UITK inspector are not showing anymore

Steps to reproduce:

1. Create a new GameObject in the Hierarchy (GameObject > Create Empty)
2. Create a new MonoBehaviour Script (Assets > Create > MonoBehaviour Script)
3. Attach the Script as a Component of the created GameObject
4. Add a "public int value = 15;" variable to the script's MonoBehaviour class.
5. Drag the GameObject to the Project Window to create a Prefab of it
6. Select the GameObject in the Hierarchy to have it appear in the Inspector
7. Modify the "Value" Property of the script Component
8. Observe the left-most side of the Inspector at the line of the modified Property

Actual results: No prefab override markers appear

Expected results: A blue prefab override marker appears

Reproducible with versions: 6000.6.0b3, 6000.7.0a1

Not reproducible with versions: 6000.6.0a7

Tested on (OS): MacOS M1 Max 26.5.1

Notes:

• Make sure this also fixes the unnecessary horizontal scrollbar.
• Enabling the setting "Use IMGUI Default Inspector" in Edit > Project Settings > Editor > Inspector (which is disabled by default) makes the Prefab Override markers appear for modified Script Component Properties