Changes to Light2D materials are not applied automatically to the 2D light's using those materials

Steps to reproduce:

1. Open the attached project
2. Open the SampleScene
3. Observe a 2D Spotlight in the Scene
4. Select the Test_Color material in the Project window
5. Change the Volumetric color property
6. Observe the 2D Spotlight light in the Scene again

Actual results: Changes to the Light2D material are not applied

Expected results: Changes to the Light2D material are applied and visible in the Scene/Game views

Reproducible with versions: 6000.7.0b1, 7000.0.0a1

Can’t test with versions: 6000.0.84f1, 6000.3.24f1, 6000.6.2f1, 6000.7.0a6 (Light and Shadow materials are not available for 2D Lights)

Tested on (OS): macOS 26.6.2

Notes:

• Material changes appear to only be applied when a domain reload occurs or when entering/exiting Play mode
• Changes made during Play mode are also not applied - changes apply only after exiting Play mode
• Shadow2D materials do not behave the same way. If the same steps are repeated with TestShadow material selected, they will be applied as expected