1. Known issue
2. Afaik you need to explore all lost sectors on Nessus first, not just the one.
3. Known issue again.
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Since it's not mentioned on the twab as a known issue I'm going to say something about it just so they know multiple people are having issues. As for lost sectors I know in beyond light it was where you only had to do that single lost sector to unlock it. Maybe it's changed I'm not sure but I know one of my clan mates had the same issue and saw a couple of people complaining about it on YouTube.