Packing slip mismatch after split shipments hit the 3PL

I had a fulfillment issue where customers received correct items, but the packing slip showed the full order even when the 3PL shipped it in two boxes. Support tickets came in because customers thought items were missing. The warehouse had done the physical work correctly; the document workflow was wrong. I reviewed the OMS order, 3PL shipment records, packing slip template, and tracking emails…