While attempting this week's Nightfall strike, I found myself unable to progress past the section where you fight off three waves of Vex by the locked door. After killing the first wave of Vex, the objective will reset and prompt me to deploy my ghost again. As a result, I have been unable to complete the strike.
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Lol this definitely happened to me 4 times in a row. Then we beat the boss in 30 seconds. Literally.