I'm having the same issue. I'm full, can't accept one from drifter from doing the public event quest step, can't delete, can't turn in... Pretty much stuck.
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Edited by iflytii: 6/10/2020 2:44:09 PM*Update to the engram issues. Running the quest on another character seems to work in unlocking/fixing the quest step. I was able to complete it on another character, then switch back to my Titan (original character) and then decrypt them just fine, allowing me to progress the quest step.