OK, this is weird, or maybe it’s not…
Just for kicks I tried renumbering the cabinets. That actually fixed all the parts that didn’t have a Comp #, but some lost their material settings. It’s was pretty easy to mass change the materials for all the parts from the same stock, so it seems to be fixed now. Not sure what was going on, but it seems to be a non-issue now.
Sorry for the false alarm.