The master's own virtual dataset fills with the error marker, so a source file that cannot be
resolved reads as masked rather than as zero counts. The virtual dataset rugnux writes into
_process.h5 was left at HDF5's default fill of zero, which is a legitimate count - the same silent
failure, one file along.
The helper moves above its first user; it has to be set before SetVirtual.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VfYvJT5Nb71suJCowRBn5z
leonarski_fandClaude Opus 5
a1b48e9454