Unit-tests that set an AuthorizationManager in their set-up phase, like typed command test here: https://github.com/10gen/mongo/blob/cbb2dd5bbf0407792b3a808bd8adc131e6fb9b51/src/mongo/db/commands_test.cpp#L268

can have this set operation race with get operations that are done in background jobs that make clients, due to the authzClientObserver here: https://github.com/10gen/mongo/blame/cbb2dd5bbf0407792b3a808bd8adc131e6fb9b51/src/mongo/db/auth/auth_decorations.cpp#L71. If the background job starts before the AuthzManager is set, this is a data race.