Shopify change history: No packing slips are being served

Shopify’s packing slip service in Admin stopped serving packing slips in a major outage from 2019-11-15 20:21 UTC to 2019-11-15 22:27 UTC, lasting 2 h 6 min. Shopify implemented a fix at 2019-11-15 22:12 UTC and confirmed resolution; no cause was stated.