I have a similar issue...completed all the Evidence Board quests today including the exotic glaive with my Warlock. I moved on to the Titan to complete the campaign and when I got to Ikora I was also full on resonant alloy. Did the same and shaped a weapon to work around it...no Mara afterwards. Now I am unable to interact with the board with the Titan and its glaive exotic shape shows locked in the relic.
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You’ve probably figured this out by now, but if not, after you get your first exotic glaive, the glaive frames for the other 2 exotic glaive only drop from the wellspring.