Cannot change Default Volume Profile when render pipeline has not been created yet

• Changing HDRP Default Volume Profile in Project Settings can fail immediately after project open because HDRP is assigned but the runtime render pipeline instance has not been created yet, so the UI treats HDRP as inactive.

Repro Steps

1. 1. Create new HDRP project
   2. Edit > Project Settings > Graphics.
   3. In the HDRP settings section, find Default > Default Profile.
   4. Click the object picker for Default Profile.
   5. Select a different existing VolumeProfile asset, for example Assets/New Volume Profile 1.asset or Assets/New Volume Profile 2.asset.
   6. Confirm the selection.
      Actual results: The Default Profile value is reverted to the previous asset, and the Console logs: Cannot change Default Volume Profile when HDRenderPipeline is not active. Rolling back to previous value.

Expected results: The new Default Profile should be accepted when HDRP is the project’s assigned render pipeline.

Reproducible with versions: 6000.6

Not reproducible with versions: -