ProbeVolumeDebug shader warnings first time opening a project

Reproduction:

1) Open the HDRP sample project from the hub

2) Enable ABV debug mode Window->Analysis-Rendering Debugger->Probe Volumes->Display Probes

3) Bake lighting

There will be warnings in the console.

Additional notes: The warnings are only visible during the first time opening or upgrading a project and it likely reproduces on any HDRP project. To reproduce it again likely you would need to clear library or shader cache.