**System Information**
Operating system: Windows 11
Graphics card: NVIDIA GeForce RTX 2070 Super
**Blender Version**
Broken: 3.2.2
Worked: None
**Short description of error**
.blend file size increases with 'Automatically pack resources' when OpenVDB volume is in scene. As far as I know OpenVDB is an unpackable data and doesn't show up in the scene if the original VDB files are deleted. However when 'Automatically pack resources' is turned on, blend file size increases exactly as much as the file sizes of VDB files but doesn't work at all when original VDB files are deleted.
**Exact steps for others to reproduce the error**
1. Make a volume object
1. Make the volume object use external VDB file
1. Turn 'Automatically pack resources' on
1. Save the blend file
1. Close Blender
1. Delete original VDB files
1. Check the blend file size. It's obviously increased
1. It seems like blend file is containing that VDB data from the outside, but when you open the blend file again, volume object shows nothing.
{F13413732}