'Group' metadata missing from genie-level ARTROOT files
The 'Group' metadata is not extracted using sam_metadata_dumper from genie artroot files produced with prodgenie_nu_spill_world_gsimple-configc-v1.
A g4 artroot file produced from such a parent genie file DOES contain the group metadata field.
This requires more digging. I'm mostly submitting the ticket now as a reminder.