vdb fill with particles doesn't work if source mesh too large

[tyFlow]

Perhaps you're hitting some memory limit by trying to create such a huge box. For example, a box with length/width/height extents of 10,000 and a voxel size of 1 will attempt to generate 1 trillion voxels. I haven't looked deep enough into the OpenVDB library to find out, but maybe they've implemented a limiter that outputs a single voxel if it recognizes a RAM limit will be reached beforehand.

Beyond that, you could post the file so I can see/test your exact setup.