I've done Pantheon twice this week, Once on the 3rd and the other one I just finished 10mins ago.
my team has gotten platinum score on every encounter for both times and twice now the caretaker platinum Score has not counted for the triumph for the seal.
I believe this is a bug and the that the source of bug my come from something bungie did when they disabled checkpoints in the Pantheon.
I've attached photos of the scores from the first one we did on the 3rd that should show we did in fact get platinum and a photo showing that caretaker platinum is not counting for the triumph.
https://i.ibb.co/PGyWH5q/20240504011828-1.jpg; https://i.ibb.co/3N7kg4s/20240504011642-1.jpg
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I am having the exact same issue. My friend did as well but when he completed it his second time without getting platinum it counted for him and not us.