Steps to reproduce:

1. import the provided package.
2. drop the VFXG_BugRepro_NonExposedSGProperty.vfx asset in your scene.
3. Open the VFX.
4. Open the ShaderGraph (SG_ExposedPropertie asset)set in the output.
5. Exposed and Unexposed the "toto" property.

Actual results: When not exposed, the color of particles which is driven by the toto property value is black. When toto property is exposed the Color is White.

!image-2025-04-24-14-10-24-436.png|width=519,height=193! *

!image-2025-04-24-14-11-02-402.png|width=520,height=216!

Expected results: The Color is driven by the shader with the Toto property value. Color should be white in both case (exposed/unexposed) as the default value of toto is 1.0.

Unexposed property default value doesn't seem to be fetch/used by VFX Graph.

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes: