Canvas Group Alpha Slider is not synchronised across multiple Inspector windows

Steps to reproduce:

1. Open the attached project
2. Open the Sample Scene
3. Select the Panel object in the Hierarchy
4. Make sure the Canvas Group component is visible in both Inspector windows
5. Use the Slider to change the Alpha value

Actual results: The Alpha value is not synchronised across multiple Inspector windows

Expected results: Alpha value is synchronised across all Inspector windows

Reproducible with versions: 6000.5.0a9, 6000.5.0f1, 6000.6.0a7

Not reproducible with versions: 6000.0.77f1, 6000.3.18f1, 6000.4.12f1, 6000.5.0a8

Tested on (OS): macOS 26.5.1, Ubuntu 24

Notes:

• Other Canvas Group settings (Interactable, Blocks Raycasts, Ignore Parent Groups) are not affected.
• Alpha values are not synced regardless if it was modified using the slider or using the input field