I grabbed all 3 quest from Eris, got them to the point where I needed to finish the quest in the mission on legend, hit all the sets with whisper and finished the mission. I can use the perks that are unlocked by the intrinsic like field prep, but I can't actually change the intrinsic, so even though I completed the quest I can't change any of my barrel, mag, or stocks. Not even when trying to craft a new one. Tried doing another legend run to see if that would fix it still nothing.
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Yours isn't bugged. You get the intrinsics from the oracle, you have done 0/7. The bug is for people that shot an oracle during the bugged period on week 1, this blocks them from shooting oracle 7.