Currently, another flawless run would be needed to unlock the lighthouse card in short order. Should Siffow decide to award the card to all players who have unlocked the Osiris card, which has the same in-game triggering event when everything works properly, that would clearly happen at some future date. Seeing as how this manner of rectification was suggested at the beginning of the Lighthouse card's bug, through the elimination of the bug, and up to the present, your safest course is still getting through a new flawless run.