At Google (long time off and on home of Hyrum), they migrated to swisstable from other hash maps. Unordered map iterates through the elements in insertion order. They explicitly couldn't support that without adding overhead to their new table so they randomized iteration order of the map

The migrations to the new table were fun because you would migrate some code and then find a test that assumed the order things were inserted into some seemingly distant protocol buffer array were in insertion order of the map

Usually the ordering was just a defect of the test, but it required actually digging in to be sure