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Complement `TestDeviceListUpdates/when_joining_a_room_with_a_remote_user` is flakey(?)
https://github.com/matrix-org/synapse/actions/runs/3149623842/jobs/5121449618#step:5:8174
Happened in worker mode---would guess there's some race the test isn't expecting?
related to https://github.com/matrix-org/synapse/issues/13783
I reckon the tests are picking up the spurious device_lists.changed instead of the real one and advancing too early.