In order to achieve the Light Seeker achievement,
you must find 5 Feathers in the Harbinger mission within a week.
However, after Bungie said it fixed a bug in the Light Seeker achievement,
now only 4 feathers are respawning, and it making the achievement impossible.
It's like trying to harass people on purpose.
Solve one bug, another bug came out.
Not surprising now.
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Yup, this is true