Steps to reproduce:
1. Create new Unity project using empty HDRP Template
2. Open VFX Graph Templates window
3. At the bottom press "Install learning templates"
4. Once installed, select "Pivot Advanced" template
5. Press "Create"
6. Select created VFX asset in the Project window
7. Observe the VFX in Preview window 

Actual results: VFX is shown white, there is no color when previewing effect in Preview window
Expected results: VFX should not be shown white, colors are present in Preview window for the effect

Reproducible with versions: 6000.0.58f1, 6000.2.6f1, 6000.3.0b2

Tested on (OS): Windows 11, macOS Silicon, Sequoia 15.6 (M1)

Notes:
1. when testing same "Pivot Advanced" VFX on empty URP project, Preview window shows all the colors of the effect