So after 20 platinum flawless master lost sector runs, not a single exotic dropped. I wouldn't call it "common" I remember exotics used to drop more frequently in the past. Something seems wrong.
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Hello there[url=https://cdn.discordapp.com/attachments/902560216871239752/989591085506515074/Hellothere.gif],[/url] Rewards from any level of lost sector are subject to RNG and as such they may drop on the first run or take many runs to obtain. Since there is no bad luck protection, each run is treated as its own independent run and has the same drop chances regardless of if it was first run or thirtieth.