Completed Daily Heroic side mission for black spindle exotic, but system reset while inside. No one in party received no drops of any kind, including Black Spindle.
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As soon as the daily reset happens, you will not be able to get the Black Spindle as a reward. This is because for the Black Spindle to drop, the "Lost to Light" mission has to be the Daily Heroic Story Mission. After reset, it is not the Daily Heroic anymore.