Adding my comment from #1814793: I set up a report to find affected line items. The report checks all the line items on a specified PO and tells me if the linked bib is deleted or not.
So if I go to that deleted bib, undelete, and try to Load Bibs and Items again, it works and all copies are loaded. So there's nothing wrong with Load Bibs and Items, it's just another instance of Bug #1634244 in action.
Adding my comment from #1814793: I set up a report to find affected line items. The report checks all the line items on a specified PO and tells me if the linked bib is deleted or not.
So if I go to that deleted bib, undelete, and try to Load Bibs and Items again, it works and all copies are loaded. So there's nothing wrong with Load Bibs and Items, it's just another instance of Bug #1634244 in action.