Making Changes to a Deck Isn't Reflected in Play Lobby
PLayers report that if they join an event with one version of a deck, drop from it, make changes to that deck, then re-join the event, the game incorrectly uses the older version of the deck.
We don't yet have confirmation whether players are stopping to check changes are reflected in the Play Lobby before re-joining. We also don't know if players are only changing the sideboard, or changing both side and main, or just main. Usually players report not changing the name of their deck prior to re-joining.